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