Circulation developed due to which of the following?
a. Animals got larger.
b. Segmentation allows increasing specialization of
body parts.
c. The development of a complete digestive tract
allows the specialization of regions to carry out
a variety of functions.
d. Circulatory systems allow more efficient transfer
of materials and gave an advantage to the
animals that developed them.
e. None of these are true.
Answer: d
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Shortly after fertilization, successive cell divisions convert the zygote into a multicellular embryo
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The idea that older, more stable habitats have greater species richness than habitats subjected to frequent, widespread
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The diffusion of water molecules across a selectively permeable membrane is called
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