Comb-jellies, or ctenophores, are similar to cnidarians in that they (select all that apply):
A. are radially symmetrical.
B. have two tissue layers surrounding a
gelatinous interior.
C. differentiate muscle cells and a simple
nerve net.
D. digest prey within their gastric cavity.
E. none of these
A,B,C,D
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The main reason polar regions are cooler than the equator is that _____
A) there is more ice at the poles B) sunlight strikes the poles at a lower angle C) the poles are farther from the sun D) the polar atmosphere is thinner and contains fewer greenhouse gases E) the poles are permanently tilted away from the sun
What is typically the first step in the scientific method?
A. Carrying out an experiment B. Making a prediction C. Making an observation D. Developing a hypothesis
A cytoskeleton enables eukaryotic cells to:
A. move. B. engulf other cells. C. change shape. D. All of these choices are correct.
Which organ system filters wastes from the
blood?
a. respiratory b. urinary c. digestive d. endocrine e. circulatory