A toothed, biting structure found in the mouths of sea urchins that is used for rasping algae is called:
a. a tube foot.
b. Aristotle's lantern.
c. a pedicellaria.
d. an ambulacral groove.
e. a dermal denticle.
B
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DNA transposable elements (DNA TEs) are:
A. a class of transposable elements that replicate and transpose via DNA replication and repair. B. a class of transposable elements that uses RNA as an intermediate. C. a class of transposable elements that uses DNA as an intermediate. D. a class of transposable elements that uses protein as an intermediate. E. a class of transposable elements that uses ribosomes as an intermediate.
A couple would like to know what the probability is that out of five children, three will be girls. This is solved using which of the following?
A. Sum rule B. Product rule C. Chi-square test D. Binomial expansion E. Random sampling error
________ receptors act more slowly because they act in a(n) ________ manner.
Fill in the blank(s) with the appropriate word(s).
What has created at least half of the oxygen in Earth's atmosphere?
A) burning fossil fuels B) trees in the boreal forest C) phytoplankton in the ocean D) plants, algae, and phytoplankton in the intertidal zone