because fossil fuels take forever to be created hope this helps
its B. Organ b/c the plants root are part of the plant
The answer is B between respiration and combustion
Answer:
The two membranes pull apart a little and create a small pocket or sack of air. As the developing bird grows, it breathes in oxygen from the air sack and exhales carbon dioxide. Several thousand microscopic pores all over the surface of the egg allow the CO2 to escape and fresh air to get in.
Explanation:
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Https://www.ncbi.nlm.nih.gov/books/NBK10039/
