Answer: changed by molecular oxygen
Explanation:
Biologically induced molecular oxygen (dioxygen, O2) started to accumulate in Earth's atmosphere and changed Earth's atmosphere from a weakly reducing atmosphere to an oxidizing atmosphere.
Answer: D
Explanation: because the 2 sides on D dont look the same
(pls mark brainlyest)
Answer: In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
<span>The animals in the food web release Carbon dioxide into the environment, which plants then use for Photosynthesis
Hope this helps!
</span>