Which statement is an example of a scientific theory? a. the amount that caffeine affects a person's heart rate differs based on the person's age. b. the earth is the third planet from the sun and has one moon, which orbits the earth. c. all living organisms are composed of one or more cells, which came from pre-existing cells. d. hummingbirds do not like the color white because they visit other colored flowers more often.

B.  All living organisms are composed of one or more cells, which came from pre-existing cells.

Just took the test!! :)

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).