Question

only human activities affect atmospheric composition
atmospheric conditions are uniform across earths surface
montana experiences temperature ranges from 105°f in summer to -40°f in winter. an evolutionary biologist studying organisms in this region would most likely focus on which adaptive strategy?
organisms that only reproduce during moderate temperature periods
organisms with physiological or behavioral adaptations to extreme temperature fluctuations
organisms that maintain constant body temperature regardless of environment
organisms that migrate to avoid any temperature variation
when comparing the environmental conditions during the dinosaur era, ice age, and present day, what does this temporal analysis reveal about natural selection pressures?

Explanation:

For the first part, natural processes also affect atmospheric composition, and atmospheric conditions vary across Earth's surface. For the second - part, in a region with extreme temperature fluctuations like Montana, organisms need physiological or behavioral adaptations to survive. Reproducing only in moderate temperatures limits survival, maintaining a constant body temperature regardless of environment is difficult in such extremes, and migrating to avoid any temperature variation may not be feasible.

Answer:

1. Neither "Only human activities affect atmospheric composition" nor "Atmospheric conditions are uniform across Earth's surface" is correct.
2. Organisms with physiological or behavioral adaptations to extreme temperature fluctuations.