In several mammals, including some rat and shrew species, the presence of two X chromosomes means the animal will be a female, whereas having just one X chromosome dictates maleness. This type of sex determination is most similar to:
A. other mammals.
B. insects.
C. bees.
D. birds.
B
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Glacier Bay in Alaska is a fjord whose lowlands were covered by glacial ice until around 230 years ago
As the glacier retreated, glacial till was exposed to plant colonization; remarkably (and fortunately for generations of ecologists), the location of the tip of the retreating glacier has been frequently documented since the late 1700's. This means that scientists have been able to develop a detailed timeline of the changes in the plant community, or _____ in Glacier Bay over time. A. ecological succession B. niche diversification C. niche divergence D. competitive exclusion E. none of these
Four of the five answers listed below are nonreproductive
parts of a flower. Select the EXCEPTION.
a. calyx b. anther c. corolla d. petal e. sepal
Density-independent limiting factors that can affect a population include
a) predation, parasitism, and human disturbances b) competition, changes of season, and natural disasters c) parasitism, predation, and competition d) human disturbances, earthquakes, and droughts
Where do plants get the energy to make organic molecules?
a. minerals b. glucose c. vitamins d. light e. water