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TEA [102]
3 years ago
15

Many species have embryos that look similar to one another and develop similar structures. Refer to the picture above. During th

e first stage of embryonic development for each species, what type of evolution could you conclude about the relatedness of the organisms? A) Divergent evolution because all of the species have similar structures during the first stage of development. B) Convergent evolution because a,l of the species have similar structures during the first stage of development. C) Divergent evolution because the species are fundamentally different even at the first stage of embryonic development. D) Convergent evolution because the species are fundamentally different even at the first stage of embryonic development.
Biology
2 answers:
Verdich [7]3 years ago
8 0

Answer:

A) Divergent evolution because all of the species have similar structures during the first stage of development

Explanation:

Took the usatestprep quiz and A was correct.

Pavel [41]3 years ago
5 0

Answer:

A) Divergent evolution because all of the species have similar structures during the first stage of development.

Explanation:

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Kudzu, a plant native to eastern Asia was introduced into America in 1876. In 1935, kudzu was planted along southern roadways to
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3 0
3 years ago
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
3 years ago
If a person with type B blood marries a person with type A blood, what phenotypes can their children be?
abruzzese [7]
There children will have type AB blood because both A and B are both dominant alleles so they will both be inherited.
8 0
4 years ago
Which of the following can affect the activity of an enzyme?
Gennadij [26K]
The correct option is 3.
Enzymes are biological catalysts which speed up the rate of biochemical reactions inside the cells. Enzymes are very specific in action and they require specific conditions called optimum conditions for them to function optimally.
When the optimum conditions are not met, an enzyme's activity will be lowered or totally stopped.
Conditions that affect the optimum activity of an enzyme include: temperature, pH level and regulatory activity of regulatory enzymes and hormones.
5 0
3 years ago
Is a egg is a living thing or not a living thing
ale4655 [162]

If the egg was fertilized is alive, The kind of egg you get at the grocery store are not alive

6 0
3 years ago
Read 2 more answers
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