16. What type of pollution causes health problems primarily through decreased mental health and stress? O A. Water pollution
O B. Species extinction
O C. Noise pollution
OD. Acid rain

Which of the following is the best definition of a eukaryota? a. a one-celled organism that does not have a membrane-bound nucleus b. a one-celled organism that does not have a cell wall c. an organism whose cells each contain a membrane-bound nucleus d. an organism whose cells each have a cell wall

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?

Explain what role the narrator believes he is playing in telling the story. describe how this belief will affect the story. your answer should be at least 250 words.