Answer:
For early earth, it was filled with loads of oxygen and could kill humans if they breathed the oxygen that was in the air about 100 million years ago. This massive amount of oxygen cause massive creatures like the dinosaurs to exist. Current earth has an atmosphere with not too much oxygen.
Explanation:
brainliest
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Thin skin contains four layer(s) of keratinocytes, and thick skin contains five layers.
-4,5
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<span>The correct option is A. Endomembrane system is a series of units that work together to label, package, and transport proteins and molecules. Endomembrane system are found in the endoplasmic reticulum and golgi apparatus. The major components of the endomembrane system are golgi apparatus, endoplasmic reticulum, vessicles, cell membrane and the nuclear membrane. </span>
Answer:
diversity throughout all living organisms
