Consider the ringlike patterns on an earthworm and "six-pack abs" in humans. In an animal's body plan, what are they both evidence of?

a. radial symmetry
b. cleavage
c. segmentation
d. mesenteries


Answer: c. segmentation

Biology & Microbiology

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Gymnosperms include plants that demonstrate which of the following characteristics? Select all correct choices

A. flesh-covered seeds B. double fertilization C. pollen-containing cones D. vascular cambia E. photosynthetic stems F. multicellular xylem vessels

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In sea urchins, the fertilization envelope forms from the:a

vitelline envelope. b. jelly coat. c. zona pellucida. d. plasma membrane. e. granulosa cells.

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Protists are alike in that all are

A) multicellular. B) photosynthetic. C) marine. D) nonparasitic. E) Eukaryotic

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In comparing the four chambers of the heart, the _______ have weak, thin walls and the ____ have thick muscular walls. 

A. right atrium and right ventricle; left atrium and left ventricle B. left atrium and left ventricle; right atrium and right ventricle C. right and left atria; right and left ventricles D. right and left ventricles; right and left atria

Biology & Microbiology