Which of the following must be present in a population in order for natural selection to occur?

a. Elevated birth rate
b. Genetic variation
c. Geographic isolation
d. Equal numbers of males and females


Answer: b. Genetic variation

Environmental & Atmospheric Sciences

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In words, what is the meaning of the coefficient -.001? What does this mean, and how can it be interpreted in the context of the population being studied?

A regression of the number of cases of a particular disease per 1000 people based on the number of people vaccinated against it as children (per 1000) is performed on data collected from 34 cities. The results are summarized below:

Intercept .914
Slope -.001

Environmental & Atmospheric Sciences

As air parcels descend in the atmosphere they ____________ and ____________. Fill in the blank(s) with the appropriate word(s)

Environmental & Atmospheric Sciences

Metamorphic rock is formed by changing the nature of minerals of preexisting rocks. What could the preexisting rocks be?

A) metamorphic B) igneous C) metamorphic, igneous, or sedimentary D) sedimentary

Environmental & Atmospheric Sciences

In a squall line, downdrafts form the ____________________ ____________________, which fuels the storm by lifting warm moist air

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences