The answer would be a.
Biological catalysts are generally proteins (and a group of RNA molecules called ribozymes), but carbohydrates do not play such a role.
Answer:
<u>The three parts of an amino acid are the carboxyl group, the amino group, and the central carbon that contains the R group.</u>
<u>hope this helps</u>
They are rare, but can significantly increase genetic diversity when reproductive rates are high<span>
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Answer:
<u>A common element among all the river valley civilizations was irrigation systems that moved water to crops and settlements</u>
Explanation:
- <u>River Valley civilizations where the civilizations that were found on the banks of the river like the Mesopotamia ,Indus valley civilization.</u>
- <u>These civilization where agriculture based civilization as they depended on river for drinking water and irrigational activities</u>
