The question below refers to the selection "taste—the final frontier." hydroponic plants are grown —
a. on mars.
b. without air.
c. in water.
d. in soil.

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

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?