Select the correct answer. Which of these activities increases the amount of carbon in the atmosphere?
A. animals eating plants
B. burning of fossil fuels
C. fossilization
D. photosynthesis
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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.