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
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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
In sea urchins, the fertilization envelope forms from the:a
vitelline envelope. b. jelly coat. c. zona pellucida. d. plasma membrane. e. granulosa cells.
Protists are alike in that all are
A) multicellular. B) photosynthetic. C) marine. D) nonparasitic. E) Eukaryotic
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