d. O2
This is because CO2 (Carbon Dioxide), energy (sunlight), and H2O (water) are all outputs of cellular respiration.
Answer:
b. There has been little to no recent growth in renewable energy use due to a lack of environmental concerns with the use of fossil fuels.
Explanation:
Fossil fuels have had tremendous negative impacts on the environment and humans as well. For that reason, the use of renewable sources of energy, such as hydropower and biomass, have become increasingly popular over the last few decades.
The answer is D.
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A) Membrane proteins are always needed.
