The key evolutionary development seen for the first time in the sponges is that of

A. multicellularity.
B. major organ systems.
C. a complete digestive tract.
D. body symmetry.


Answer: A

Biology & Microbiology

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Evolution acts at the level of the

A. species. B. community. C. ecosystem. D. population.

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Pattern of inheritance in which a trait is controlled by several allelic pairs.

What will be an ideal response?

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The area directly below the neritic zone is called:

a. abyssal plain. b. ocean basin. c. trench. d. continental margin. e. hadal zone.

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Which trait is found within all human cultures?

a. Parasitism b. Infanticide c. Selfish herd d. Predation e. Eusociality

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