Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.
Answer:
Based on the cladogram, which two species share the most recent common ancestor?
lizard and owl
Explanation:
Answer:
negative feedback
Explanation:
Insulin reduces blood sugars when the levels are high in the blood. The hormone is produced by the pancreas and binds on receptors of cells. This initiates cell signaling mechanisms that signal the cell absorb sugars. When the blood sugars get back to normal, insulin production is reduced.
Answer:
ABO Typing
Explanation:
The test to determine your blood group is called ABO typing.