Sea otters play an important role in maintaining the sea urchin population in the kelp forest. the sea otter is known as a
keystone species
key species
checking species
controlling species

Which of the following is not a defining characteristic of plants?

Which of the following typically characterizes a tropical rainforests

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?