7. (7.7A) Reptiles do not have the ability to create their own heat, and instead, sit in the sun for long periods of time in the mornings to warm up. Mammals and birds, on the other hand,
have the ability to create their own heat. Where do mammals and birds get the energy for
this heat?

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

Name the organism that belongs to the kingdom protista.

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?