CHAPTER 1

How does a population differ from an ecosystem?

An ecosystem includes a community, whereas a population does not.

A study shows that people who eat fish three times a week live longer. Based on this study, which of the following can you not conclude?

Eating fish causes longer life.

Which of the following is an example of an epidemiological experiment?

Researchers look at the pattern of cancer development across populations in New England.

Which of the following is not a characteristic of all living things?

They are composed of multiple cells.

Which of the following is NOT a characteristic of life?

differentiation from cells to tissues

A forest contains many organisms and a variety of habitats. Therefore, it is considered to be a(n) __________.

ecosystem