Which of the following forms of nitrogenous waste is excreted by mammals?
A. ammonia
B. urea
C. nucleotides
D. uric acid
E. allatonin
B. urea
Biology & Microbiology
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The earliest vertebrates were ________
a. jawless fishes b. tunicates c. lancelets d. placoderms
Biology & Microbiology
The chemical composition of urine reflects the processes of
A. filtration. B. reabsorption. C. secretion. D. concentration. E. All of the answer choices are correct.
Biology & Microbiology
A change in a population that is NOT related strictly to the size of the population is best described as
a. density-dependent. b. density-independent. c. within. d. an S-shaped curve. e. a J-shaped curve.
Biology & Microbiology
Changes due to developmental plasticity are reversible
Indicate whether the statement is true or false
Biology & Microbiology