Answer: The half-reactions represents reduction are as follows.
Explanation:
A half-reaction where addition of electrons take place or a reaction where decrease in oxidation state of an element takes place is called reduction-half reaction.
For example, the oxidation state of Cr in
is +6 which is getting converted into +3, that is, decrease in oxidation state is taking place as follows.

Similarly, oxidation state of Mn in
is +7 which is getting converted into +2, that is, decrease in oxidation state is taking place as follows.

Thus, we can conclude that half-reactions represents reduction are as follows.
Answer:
2. Behavioral Adaption
Explanation:
I know about this, I think this is the answer. Try it out!!
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Molecules consist of multiple atoms put together to create a new form.
All organic compounds have at least 1 carbon and 2 hydrogen atoms.
For sediments to become a sedimentary rock, it usually undergoes burial, compaction, and cementation. (Hope that helps)