What did Charles Darwin learn from reading the work of geologists in the early 1800's?
A. All geological change is caused by living organisms.
B. Earth is relatively young.
C. The processes that formed old rocks on Earth do not operate today.
D. Earth is very old.

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.