A is your answer I believe because they do indeed provide a way to review other scientists work and or experiments
Alternative energy sources are those that do not deplete natural resources and do not harm the environment.
Options A, B, and C are all fossil fuels, which we know can be depleted and harm the environment.
The only valid option here is D, Geothermal energy.
Geothermal energy is both renewable and environmentally friendly.
Carbon enters the atmosphere as carbon dioxide from respiration and combustion. Carbon dioxide is absorbed by producer to make carbohydrates and photosynthesis. consumers feed on the plants passing the carbon compounds along the food chain.<span />
