Question

which human activity adds extra carbon dioxide into the atmosphere? a. planting more trees b. using wind energy c. burning fossil fuels d. photosynthesis question 7 1 pts which organisms are responsible for converting nitrogen gas (n₂) from the atmosphere into a form plants can use? a. nitrogen - fixing bacteria b. producers c. consumers d. decomposers

Explanation:

1. For the first question, burning fossil fuels releases carbon - stored in them as carbon dioxide into the atmosphere. Planting trees absorbs carbon dioxide, using wind energy doesn't produce carbon dioxide, and photosynthesis absorbs carbon dioxide.
2. For the second question, nitrogen - fixing bacteria convert atmospheric nitrogen gas ($N_2$) into a form usable by plants. Producers make their own food through photosynthesis, consumers eat producers or other consumers, and decomposers break down dead organisms.

Answer:

1. C. Burning fossil fuels
2. A. Nitrogen - fixing bacteria