People and animals breathe in oxygen from the air and exhale carbon dioxide.

what happens to the carbon dioxide in the air?

a. some animals breathe in carbon dioxide and exhale oxygen.

b. the carbon dioxide floats into the atmosphere and forms clouds.

c. plants use carbon dioxide to make sugars and oxygen

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

25. what does meiosis create? haploids or diploid? somatic cells or gametes?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils