Which factor may contribute to the development of osteoporosis?
a. calcium absorption
b. over-production of sex hormones
c. smoking
d. an active life style
e. puberty
C
Biology & Microbiology
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When two or more species depend on the same limited resource for survival, occurs.
A. coevolution B. competition C. succession D. stotting E. symbiosis
Biology & Microbiology
The ammocoete is the larva of
a. lampreys. b. sharks. c. bony fishes. d. amphibians.
Biology & Microbiology
Which substance is found in RNA but not in DNA?
a. thymine b. deoxyribose c. uracil d. guanine e. cytosine
Biology & Microbiology
Which of the following is typically predictive of second-male advantge in mating?
A. lekking B. copulatory plug C. mate guarding D. large testes and ejaculate volume E. none of these are predictive of second-male advantage
Biology & Microbiology