In clonal selection of b cells, which substance is responsible for determining which cells will eventually become cloned?.

The negative impacts of nonnative species generally outweigh the positive impacts

This is the process of making a prediction based on the results of prior observations of similar events.

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?