Which contributes to the greenhouse effect?
A. moving tectonic plates
C
B. warming water during El Niño
C. burning organic matter
D. eroding rocks and soil

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods

What do all of the above organisms have in common

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?