A mammal is and has a body temperature .
A. ectothermic; that changes with fluctuation in environmental temperature
B. endothermic; that changes with fluctuation in environmental temperature
C. ectothermic; maintained by its own metabolism
D. endothermic; maintained by its own metabolism
E. None of the answer choices is correct.
D. endothermic; maintained by its own metabolism
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The frequency of sound waves reaching the ear determines:
A. intensity of sound B. loudness C. pitch D. tone
Large, high molecular-weight proteins are always found
a. nearer the top of the gel. b. close to the middle of the gel. c. nearer the bottom of the gel.
In the case of human height genes, a gene on chromosome 15 codes for an enzyme that converts testosterone to estrogen. This enzyme influences human height because:
A. testosterone helps bones to fuse at their ends and thus stop growing. B. estrogen brings on menstruation and thus an end to growth in height. C. estrogen helps bones to fuse at their ends and thus stop growing. D. testosterone prevents bones from fusing and thus continues growth in height.
A rapidly growing recreation industry where people travel to visit unique biological communities is called ________
Fill in the blank(s) with correct word