In humans, helminths generally infect the ________.
A. nervous system
B. urinary tract
C. gastrointestinal tract
D. skin
E. muscular system
Answer: C
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Warm, still water holds __________oxygen than cold
Fill in the blank(s) with correct word
An ideal organism for a geneticist to use as a study organism would possess which of the following characteristics?
A) A relatively short life cycle B) A large degree of genetic variation among individuals C) Matings that produce large numbers of offspring D) A well-characterized genetic background, karyotype, etc. E) All of these are desirable characteristics
The last stage of succession is the
A. early community. B. climax community. C. biome community. D. pioneer community.
Which of the following conditions would most likely be due to high blood pressure in a mammal?
A) bursting of blood vessels in capillary beds B) inability of the right ventricle to contract C) reversal of normal blood flow direction in arteries D) destruction of red blood cells