Question

question 12 of 20 : select the best answer for the question. 12. an amniotic egg protected by a shell is an evolutionary development most likely driven by which of the following? a. the threat of predators to eat eggs b. the need to reproduce on dry land without letting the egg dry out c. the inability of eggs to acquire nutrients to grow complex animals d. environmental conditions caused eggs to over - absorb dangerous molecules from the environment mark for review (will be highlighted on the review page)

Explanation:

To determine the correct answer, we analyze each option:

• Option A: While predators can be a threat, the primary evolutionary driver for the amniotic egg with a shell is not just predator avoidance. The shell's main function related to reproduction on land is more critical.
• Option B: Amniotic eggs with shells allow reptiles, birds, etc., to reproduce on dry land. The shell prevents desiccation (drying out) while still enabling gas exchange, which is essential for developing embryos in a terrestrial environment. This aligns with the key evolutionary advantage of the amniotic egg.
• Option C: Amniotic eggs have sufficient nutrients (like yolk) for embryo development, so this is incorrect.
• Option D: There's no evidence that the shell evolved to prevent over - absorption of dangerous molecules; its main role is related to water retention and gas exchange for terrestrial reproduction.

Answer:

B. The need to reproduce on dry land without letting the egg dry out