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.

a. to encourage apoptosis

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.