The mature male gametophyte is indicated by the letter ____
a. A
b. B
c. C
d. D
e. E
ANSWER: d
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Nematocysts are found only in
a. cnidarians. b. roundworms. c. crustaceans. d. echinoderms. e. arthropods.
The approximate age of the Earth is:
a. 100,000 years. b. 1.2 billion years. c. 4.6 billion years. d. 10.5 billion years. e. 13.6 billion years.
If the teacher wanted to show the students what a lophophore is and how it works, the teacher would point out a feeding _____
A) hydra B) sponge C) gastropod D) ectoproct
Describe how mean and variance of a trait value change in the absence of an evolutionary trend as a lineage diversifies
Use +, –, or = to describe an increase, a decrease, or no change, respectively. You can use one, two, or all of the symbols to describe the possible changes in both mean and variance. Mean: Variance: What will be an ideal response?