In the 1970's, what element was removed as an additive from
gasoline?
A. copper
B. zinc
C. palladium
D. lead

Twind is considered to be an abiotic factor because it.?

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?

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?