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timurjin [86]
2 years ago
13

NASA spends about 80% of its funding to pay for scientific

Biology
2 answers:
salantis [7]2 years ago
8 0

Answer:

the answer for this is B.

Sonbull [250]2 years ago
8 0

Answer:

The answer is D.

I just took the test.

Explanation:

You might be interested in
Why are there lefties (and righties)?
malfutka [58]

Answer:

These changes are often brought about by environmental influences and can affect how a baby grows. These gene-expression differences could affect the right and left parts of the spinal cord differently, resulting in lefties and righties.

Explanation:

Most people — about 85 to 90% — are right-handed, and there's no population on Earth where left-handers are in the majority.

That uneven split has had some historic downsides for lefties. They've had to use scissors, desks, knives and notebooks that were designed with righties in mind. Many lefties were forced, against their natural inclination, to write with their right hands (including some famous examples like King George VI of England). They've been discriminated against and eyed with suspicion, as evidenced in the language used to describe lefties. "Right" in English obviously also means "correct." The etymology of the word "sinister" can be traced back to the Latin word for "left."

While the stigma against left-handedness has faded in most places, scientists are still confounded by the righty-lefty divide. Researchers are still trying to understand what makes people prefer one hand over the other and why righties dominate.  

On an individual level, handedness might be determined at the earliest stages of development. Scientists reported in 2005 in the journal Neuropsychologia that fetuses will show a hand preference in the womb (by sucking the thumb of one hand), a proclivity that continues after they're born.  

While there's no righty or lefty gene, DNA does seem to play a role in handedness. In a recent study published in Brain: A Journal of Neurology, researchers at the University of Oxford looked at the DNA of about 400,000 people in the U.K. and found that four regions of the genome are generally associated with left-handedness. Three out of these four regions were involved in brain development and structure. Some researchers hope that studying the biological differences between lefties and righties could shed light on how the brain develops specializations in its right and left hemispheres.  

The right stuff

Trying to answer the question of handedness from an evolutionary perspective is also complicated. Researchers can detect handedness in the archaeological record by looking for certain anatomical traits in prehistoric skeletons, such as asymmetry in the size and density of arm bones, and by examining prehistoric tools.  

"If you know how the tool was held and how it was used, then you can look at the wear traces" to determine if a lefty or righty used the tool, said Natalie Uomini, a senior scientist at the Max Planck Institute for the Science of Human History in Germany. Scientists can even look at the direction of diagonal scratches on fossilized teeth to see which hand people were using to tear off meat or animal hides in their mouths.

Righties have dominated for as far back in the archaeological record as researchers can see, about 500,000 years, Uomini said. Neanderthals, our now-extinct human cousins, were also strongly right-handed.  

That makes humans pretty strange among animals. Several nonhuman species, such as the other great apes, are individually handed, but the split between righties and lefties is typically closer to 50-50.

What caused our extreme bias toward right-handedness to evolve and persist? From an evolutionary perspective, if right-handedness evolved because it had some kind of advantage, then you might expect left-handers to disappear completely, Uomini told Live Science. She added that there are some disadvantages to being left-handed, such as higher frequencies of work accidents. Researchers also linked left-handedness to learning disabilities, in a study published in 2013 in Brain: A Journal of Neurology.  

But there's a leading theory to explain why left-handers have maintained a constant minority: the fighting hypothesis.  

"The idea is that in hand-to-hand combat, or in combat with weapons, there is an evolutionary advantage to being a minority left-hander," Uomini said. "If you're left-handed, you have a surprise advantage because most people are used to fighting against right-handers." That lefty advantage has been shown in one-on-one sports like fencing, scientists reported in 2010 in the journal Laterality.  

If that hypothesis is correct, it would mean that even though the downsides to left-handedness were significant enough to keep lefties in the minority, lefties' advantage in combat at least gave them a fighting chance against eventual extinction.

7 0
3 years ago
Read 2 more answers
A single-molecule microscopy experiment is performed on a slide containing 1000 molecules each of green, red, cyan, and yellow f
LenaWriter [7]

Please see the attached file for the correct answer

7 0
3 years ago
What are some negative impacts of having this life cycle that might have contributed to a decline in the dragonfly population?
KonstantinChe [14]

Answer:

Dragonflies are important for our environment.

Explanation:

Dragon flies belongs to the ancient family of insects. They are found on every parts of the world and have been from around 300 millions years ago. There are more than 5000 different species of them found in different parts of the world. Conserving dragonflies is important as they considered as a valuable environmental indicators.

Dragon flies are found in the areas where water is available and near grasslands. Their life cycle is an example of an incomplete metamorphosis. The dragon flies lays their eggs near the water or in the water. Dragon flies spends most of the life time as a nymph in the water where they turn into an adult and leave the water. The dragon flies rely on the aquatic ecosystems all through their life. Thus dragonflies are an important indicators of the environment and water quality.

Most of the life cycle of the dragon flies depend on the availability of water and its quality. Polluting water and destroying their habitat will result in the decline of the population of the dragon flies.

5 0
2 years ago
Alguien me podra ayudar en estas preguntas pls
Elodia [21]

Answer:

2. Si, porque de otra manera se producirían daños el medioambiente, deforestación, y degradación del suelo, el cual es un recurso no renovable.

3. Algunos ejemplos: Rotación de cultivos, mulching, abonos orgánicos o naturales, asociaciones de cultivos.

4. Si, porque no dañan el suelo.

6. La problemática se basa en un mal uso de los recursos hídricos, la falta de riego en los cultivos.

8. Si, porque como se mencionó anteriormente, un uso indiscriminado de químicos daña al medio ambiente.

<u />

Explanation:

La agricultura consiste en la práctica de cultivar plantas y criar ganado. Dicha técnica fue clave para el desarrollo de la civilización humana mediante la cual la cría de especies domesticadas y recolección de cultivos creó alimentos que permitieron a la gente vivir en ciudades. En el siglo XX, la agricultura industrial basada en el monocultivo a gran escala llegó a dominar la producción agrícola. En la agronomía moderna, el fitomejoramiento, el uso de los productos agroquímicos como los pesticidas y fertilizantes, y los desarrollos tecnológicos han aumentado considerablemente el rendimiento de las cosechas, al tiempo que han provocado daños ecológicos y medioambientales generalizados. Las prácticas modernas de cría de animales han aumentado la producción de carne, pero han suscitado preocupación por el bienestar de los animales y los daños medioambientales. <u>Los problemas medioambientales incluyen la contribución al calentamiento global, el agotamiento de los acuíferos, la deforestación, la resistencia a los antibióticos y el uso de hormonas de crecimiento en la producción industrial de carne</u>. Ejemplos de esta degradación del medio ambiente incluyen a la pérdida de biodiversidad, la desertificación, la degradación del suelo y el calentamiento global, que  a su vez provocan la disminución del rendimiento de las cosechas.

2. Si, porque de otra manera se producirían daños el medioambiente, deforestación, y degradación del suelo, el cual es un recurso no renovable. El uso sostenible del suelo permite conservarlo como recurso a largo plazo sin que se produzca su deterioramiento. Al no hacer uso sostenible del suelo, se pone el peligro la agricultura y a su vez la producción de alimentos. Hay que considerar que el suelo es un componente y recurso importante, un reservorio de gran parte de la biodiversidad del planeta. La vida de la flora y fauna depende del buen estado del suelo y nos resulta útil para la obtención de materia prima, siendo el área productiva del mismo limitada y bajo amenaza por los usos intensivos necesarios para satisfacer las demandas actuales. La gestión sostenible de los recursos del suelo contribuye eficazmente a prevenir el cambio climático.

3. Algunos ejemplos:

  • Rotación de cultivos: Consiste en la siembra sucesiva de distintos cultivos en un mismo terreno, a diferencia del monocultivo que se basa en la siembra repetida en el mismo campo. La rotación sirve para reducir la incidencia de plagas ya que se altera el ciclo de vida de los mismos, para controlar malas hierbas, para una distribución mas adecuada de nutrientes, etc.
  • Mulching: Consiste en un método de corte en el cual la máquina cortacésped corta, se tritura, y se deja caer al suelo para que sirva como abono natural.
  • Abonos orgánicos o naturales: Por ejemplo, estiércoles, compostas o residuos de cultivos. Permiten recuperar materia orgánica para la fijación de carbono, aumentan la actividad microbiana, favorece retención y uso de nutrientes y mejora la absorción de agua.
  • Asociaciones de cultivos: Consiste en la siembra de dos o más especies próximas entre sí para que puedan beneficiarse la una de la otra.

4. Si, porque no dañan el suelo, no se utilizan compuestos artificiales o contaminantes y permite un crecimiento de la vegetación de forma mas natural, sin agotar sus recursos.

6. La problemática se basa en un mal uso de los recursos hídricos, la falta de riego en los cultivos. El riego consiste en brindarle agua a los cultivos para satisfacer sus necesidades hídricas que no fueron cubiertos mediante las lluvias, entonces es necesario capacitar a los agricultores para el correcto mantenimiento de los cultivos en cuanto a la proporción de agua que se les debe brindar.

8. <u>Si, porque como se mencionó anteriormente, un uso indiscriminado de químicos daña al medio ambiente.</u> Como así también disminuye la calidad de la fruta, afectando su sabor y sus nutrientes.

La mosca de la fruta es un insecto que produce un daño al picar el fruto, así las hembras realizan la ovoposición generando una vía de  entrada de hongos y bacterias que descomponen la pulpa de la fruta. Esto hace que se produzca una maduración precoz y caída del fruto, y la consiguiente pérdida de cosecha. Es necesario controlar esto pero de manera responsable.

3 0
2 years ago
Is rust eating a hole in a metal bucket living or nonliving?
Nookie1986 [14]
It is nonliving because it is just more metal, except it is changing.
6 0
2 years ago
Read 2 more answers
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