What is called the "building block" of
life?
)))
atom
organism

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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?

What two conditions must be present for osmosis to occur?