Which of the following processes returns carbon from this vast reservoir to the active carbon cycle? ( more than one answer may be right) a. burning fossil fuels b. sedimentation c. photosynthesis d. decomposition of dead organisms

During a hot day, warm and moist air rises and cools in the atmosphere. which even would occur next on such a day? a. condensed droplets would gather to become water vapor. b. water vapor would condense into tiny droplets. c. water droplets would evaporate to form rain and snow.

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

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?