Which best defines matter?
O
A. All the living things on the planet
O
B. All solid objects that can be seen
O
C. Anything in the atmosphere
O
D. Anything that takes up space and has mass
SUBMIT
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The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis