Answer:
Explanation:
a bird feather is biotic because it was made on a living thing. fog is abiotic because its not living or was never living. i might be wrong about the feather tho.
Two major types of organelle in eukaryotic cells, mitochondriaand plastids such aschloroplasts, originated as bacterial endosymbionts.
Answer:
4
Explanation:
This is the answer because I have tested it and got it correct. As oxygen-rich (and carbon dioxide-poor) blood travels by a cell the oxygen diffuses through the cell membrane to the area of lower concentration inside the cell. It can do this easily because the oxygen molecule (O2) is very small and has no charge or polarity. The oxygen is used up rapidly by mitochondria.
A human can survive with only one kidney
