Answer:
immature ovulate
Explanation:
An ovulate cone will become a mature gymnosperm cone after all of the ovules mature into seeds.
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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The polysaccharide is the compound that is unlike wax, saturated fat, and the phospholipid. An example of a polysaccharide is starch.
The theory would be endosymbiont theory. It was developed on the idea that some eukaryotic organelles come from prokaryotic organisms. It is also known as symbiogenesis. This theory says that these organelles were first from prokaryotic cells that is living inside a host cell.
Answer:
1. Precambrian rocks are very old.
2. They have very few fossils.
