A.Water currents in the ocean are much stronger than any sperm. How do sperm and egg find each other?B.In humans there are no water currents and the volume of the female reproductive tract is relatively limited. Then, why does the male have so many sperm?C.Why do sea urchins have external fertilization?D.Then why don't the parents take care of the young?E.Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?

Fertilization means sperms and eggs coming close to each other and forming a zygote. It may be…

A. Water currents in the ocean are much stronger than any sperm. How do sperm and egg find each other? B. In humans there are no water currents and the volume of the female reproductive tract is relatively limited. Then, why does the male have so many sperm? C. Why do sea urchins have external fertilization? D.

A. Water currents in the ocean are much stronger than any sperm. How do sperm and egg find each other? B. In humans there are no water currents and the volume of the female reproductive tract is relatively limited. Then, why does the male have so many sperm? C. Why do sea urchins have external fertilization? D.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter51: Animal Development

Section: Chapter Questions

Problem 3TYU

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Similar questions

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in your own words: Compare the reproductive organs of reptiles and birds. How are their reproductive patterns advantageous for their survival?
Observation of the development of embryos in sea stars shows the mesoderm forming pouches bulging from the archenteron to form the coelom. From this observation, you can predict that A. the cleavage of the embryo is radial. B. the adult animal will have bilateral symmetry. C. the mouth forms from the first opening in the gastrula. D. the animal is diploblastic.
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What is NOT a difference between Strepsirrhines and Haplorrhines? A. Strepsirrhines are mostly nocturnal, while Haplorrhines are mostly diurnal B. Strepsirrhines have forward-facing eyes, while Haplorrhines have lateral-facing eyes C. Strepsirrhines have wet noses, while Haplorrhines have dry noses D. Strepsirrhines have a post-orbital bar, while Haplorrhines have a post-orbital plate
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Which of these is the correct explanation of mass change in developing eggs as illustrated in the graph? Select one: A. A is the correct representation of mass change because as the baby bird develops inside the egg, it grows new parts. B. B is the correct representation of mass change because the baby bird uses cellular respiration to fuel the biosynthesis of new parts and gives off mass as CO2. C. C is the correct representation showing that nothing new comes into the egg and nothing leaves the egg, so it retains the same mass.
Which of the following are mismatched? (a) endoderm; lining of the digestive tube (b) ectoderm; circulatory system (c) mesoderm; notochord (d) mesoderm; reproductive system (e) ectoderm; sense organs