Adaptations in a species are caused over time by_ natural selection
genetic modification
variation
pollution

Read the article about the fraser river, one of the most important rivers in canada. what is the most important species of fish in this river? why are the numbers of these fish declining?

The language and religion of france developed from which people? a. the franks b. the gauls c. the anglo-saxons d. the romans

According to speculation and study, what will happen to the global birth rate in about 40 years? (1 point)