Which of the following is not a characteristic of all living things?
a. reproduce asexually
b. made of cells
c. have a metabolism
d. respond to a stimulus

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

In meiosis ii during anaphase ii which structures separated homologous chromosomes or sister chromatids

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?