The first paragraph is mainly organized as a a) definition of instrumental support with examples.
Ob) list of reasons for the positive influence of a social network.
c) contrast between positive and negative influences of family and friends.
Od) list of types of people to include in strong social networks.

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.