Most organisms in the animal kingdom a. are autotrophic and reproduce sexually. b. are heterotrophic and reproduce sexually. c. are heterotrophic and reproduce asexually. d. have prokaryotic cells and reproduce asexually.

Secondary pollutants are more harmful than primary pollutants. select the best answer from the choices provided ot of

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?