S phase, g0, g2, g1, metaphase and prophase
From a modern genetic perspective, this is defined as evolution.
According to the second law of thermodynamics, energy is never 100% efficient because some of the energy disperses as heat.
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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