An ecosystem contains
Select one:
a. only the biotic (living) components of the environment.
b. only the abiotic (nonliving) components of the environment.
c. only the energy flow components of an environment.
d. both the living organisms and the abiotic components of the environment.
e. only the food relationships found in an environment.
d. both the living organisms and the abiotic components of the environment.
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Estradiol is a potent stimulator of vitellogenesis (yolk production) in egg-laying vertebrates. Increasing evidence suggests that many pollutants, for instance those derived from pulp mills, may mimic the actions of estradiol. If one were to place a sexually immature fish in water containing pulp mill effluents, what might you expect would occur?
A. The rate of vitellogenesis would decline. B. The rate of vitellogenesis would increase. C. The fish might reach sexual maturity sooner. D. The rate of vitellogenesis would decline and the fish might reach sexual maturity sooner. E. The rate of vitellogenesis would increase and the fish might reach sexual maturity sooner.
What is the source of the envelope in enveloped-viruses?
What will be an ideal response?
A zygote is a(n) ____
a. diploid cell b. haploid cell c. gamete d. female gonad e. male gonad
Which of the following muscles is under voluntary control?
A. uterus B. intestine C. heart D. biceps