Among cnidarians there are two basic body plans, the medusa and the polyp, which differ in that ________
a. the polyp is motile and the medusa is sessile
b. the medusa lacks the mesoglea, a buoyant flexible skeletal layer
c. the medusa is motile with its tentacles downward, while the polyp is sessile with its tentacles upward
d. the medusa has stinging cells called nematocysts but the polyp does not
c
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The model of island biogeography predicts that species richness will increase with decreasing distance from a species source pool. Which do you think would be considered the two most important source pools for a particular island? Select two options.
_____ A small, distant island. _____ A nearby island undergoing primary succession. _____ The closest mainland area. _____ A nearby, large island. _____ A distant, large island with similar habitats.
The site of fertilization is labeled
a. 1. b. 2. c. 3. d. 4. e. 5.
The figure below illustrates a(n)
a. FAD coenzyme. b. cytosine nucleotide. c. thymine nucleotide. d. ATP molecule. e. adenine nucleotide.
Is PSA screening still recommended for healthy men? Why or why not?
What will be an ideal response?