Which of the following is a way that humans impact rivers and streams? a-) pollution b-) dams c-) flooding d-) all of the above

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Ture or false evidence for evolution includes millions of fossils