Which of the following conditions would lead to a small population size?
a. a low birth to death ratio
b. a high birth to death ratio
c. immigration
d. large number of resources

The correct answer is option a. "a low birth to death ratio".

Explanation:

The birth to death ratio (BDR), is basically the mean of births in comparison to the mean of deaths in a particular region. BDR is used to track the changing relationship between fertility and mortality in a population. A value of more than 1 means that there is an increase in the number of people in a region. On the other hand, a low BDR would lead to a decrease in the population and eventually in the formation of a small population. For instance, regarding the white population in the US the BDR fell from 1.21 in 2000 to just 0.98 in 2016.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.