Answer: it is a voulme of rock
Explanation:
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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Answer B sounds reasonable
Answer:
Toothpaste
Explanation:
Toothpaste commonly uses minerals like calcium and fluoride, hope this helps :)
The example of a nonpoint source of freshwater is the first option: <span>pesticide runoff from farm fields. This is one of the most common nonpoint source of poullution</span>
