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zvonat [6]
3 years ago
10

What is the process by which a trait present in an ancestral organism is modified by natural selection over time in descendants

of that ancestor? a)convergent b)evolution c)homology d)descent with modification analogy.
Biology
1 answer:
dolphi86 [110]3 years ago
4 0

Answer:

d) descent with modification

Explanation:

According to my research on Darwin's theory of natural selection, I can say that based on the information provided within the question the term being described is called descent with modification. This basically refers to the most dominant traits being passed down from generation to generation, and being modified little by little in each lineage. Which is done through natural selection.

I hope this answered your question. If you have any more questions feel free to ask away at Brainly.

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Los métodos hormonales son eficientes porque: * A: impiden la entrada de los espermatozoides C: Se inhibe (no se desarrolla) la
timofeeve [1]

Answer: C: Se inhibe (no se desarrolla) la ovulación.

Explanation:

Los métodos anticonceptivos se utilizan prevenir el embarazo no deseado, evitando que el esperma fertilice a un óvulo. Hay distintos tipos, los cuales se clasifican en:

  • Anticonceptivos hormonales: Contienen hormonas, tales como estrógeno y progesterona, que previenen la ovulación (es decir, la liberación de óvulos de los ovarios). De esta manera, al no haber óvulo disponible, por mas que hayan espermatozoides, no va a ocurrir ninguna fecundación. El método mas conocido es la píldora o pastilla anticonceptiva.
  • Anticonceptivos de barrera: Proveen una barrera física que impide la fecundación al impedir el encuentro entre el óvulo y el espermatozoide. Por ejemplo, el uso de preservativos o condones. En estos métodos, se impide la entrada de los espermatozoides, no se encuentran con el óvulo y la esperma queda atrapada dentro del condón.
  • Anticonceptivos permanentes: Proveen un método permanente como  por ejemplo el Dispositivo Intrauterino que se coloca en el tracto uterino con una vida media de meses o años y posee un efecto espermicida que mata a los espermatozoides (por lo que no lograrán encontrar un óvulo). Otro ejemplo es la vasectomía, la cual es una cirugía que corta los conductos deferentes que transportan a los espermatozoides por lo que ya no pueden salir de los testículos para producir la fecundación (quedan atrapados dentro de los testículos, no entran al tracto uterino y no encuentran al óvulo)

Tanto los métodos de barrera como los permanentes, no inhiben la ovulación aunque si impiden que el óvulo se encuentre con el espermatozoide. <u>Entonces, los métodos hormonales son los únicos que logran inhibir la ovulación</u>. Las píldoras que poseen las hormonas previamente mencionadas pero fabricadas sintéticamente. Las mismas mimetizan el efecto de las hormonas naturales producidas por el cuerpo, alterando el ciclo menstrual regular y así evitan el embarazo ya que no habrá óvulo disponible para fecundar. Además, también pueden alterarla mucosidad en el cuello del útero para que los espermatozoides no pueden atravesarlo y llegar al óvulo. De todas maneras, el objetivo principal y mas importante de los métodos hormonales es bloquear la ovulación.

6 0
2 years ago
Forested land in the Amazon basin is currently being cleared for agriculture, just as land in the Midwestern U.S. was cleared fo
strojnjashka [21]

Answer:

The correct answer is statement b.

Explanation:

This is due to the fact that the reduction of the vast majority of forest land, that is, mainly in Brazil has resulted in the extinction of the unknown and the familiar species. This has also declined the biological diversity and thus has immensely affected the fertility of the soil.  

The soil has turned shallow and thus are less fertile in comparison to the Mid-Western United States. The Midwestern parts of the United States possess variety of soils, which are produced due to the glacial deposits and thus provides more fertility to the soil.  

5 0
3 years ago
Sketch space filling models of a hydrogen molecule and carbon dioxide
Aleks04 [339]
<span>The space-filling model of a hydrogen molecule would be something like OO , two circles stuck to each other, even squished a little bit. The model for carbon dioxide would be like OOO, with the two circles on the sides a little bigger and squished into the middle circle. </span>
5 0
3 years ago
12. The ability of Carbon to form up to 4 bonds is important to living organisms in that it allows Carbon to
givi [52]

Answer:

D, form rings and chaines i think

Explanation:

This allows the Carbon to form long chians with elements such as hydrogen and phosphorus, etc, used some info from this site

https://courses.lumenlearning.com/wm-nmbiology1/chapter/carbon-and-carbon-bonding/

if my answer helps please mark as brainliest.

8 0
2 years ago
Soil reaction is _______. a. the measure of the acidity or alkalinity of soil b. the highest amount of cations soil can absorb c
VikaD [51]
I believe that the answer is A, if I am not mistaken!
4 0
3 years ago
Read 2 more answers
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