The risk of having a baby with Down syndrome is associated with:
A. the age of the mother.
B. the health of the mother.
C. the socio-economic status of the mother.
D. the IQ of the mother.
E. All of the answer options are correct.
A
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Species richness increases _____
A) as we increase in altitude in equatorial mountains B) as we travel southward from the North Pole C) on islands as distance from the mainland increases D) as depth increases in aquatic communities E) as community size decreases
You are given an embryo with eight cells and you carefully separate them and allow them to develop in separate containers. Each of the cells forms a complete embryo that develops normally into an adult animal. How would you categorize your animal?
A. It has indeterminate cleavage. B. It has determinate cleavage. C. It is a protostome. D. It is an annelid, mollusk, or arthropod. E. It has spiral cleavage.
Which environment is most likely to produce trees without annual rings?
a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. none of these, because annual rings are characteristic of all trees
Immunity that develops over time due to exposure to various antigens is termed
a. adaptive immunity. b. learned immunity. c. compensated immunity. d. coordinated immunity. e. innate immunity.