Answer:
A.
Explanation:
Humans used to use the appendix for good bacterial health in the gut. People used to drink dirty water and eat food that had lots of bacteria. The appendix would save them from infection.
C<span>ross-cutting relationships state that an igneous intrusion is will be younger than the rock it cuts across.
Hope that helps! :D
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That things looks like the devil literally run
Answer:
It's Oxygen.
Explanation:
Some abiotic factors, such as oxygen, are important in aquatic ecosystems as well as terrestrial environments. Terrestrial animals obtain oxygen from the air they breathe. Oxygen availability can be an issue for organisms living at very high elevations, however, where there are fewer molecules of oxygen in the air.
hope it helps.
