The answer is; fossil
Fossil is defined as any dead organism ( or its trace or impression) of a past geological time that is naturally preserved in the earth in geological features such as rocks, bogs, and etcetera. Coral reef is no exception because it is considered a living organism. It is composed of colonies of coral polyps and algae that secrete a carbon carbonate skeleton.
D through a microscope!
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B. Resistance is the tendency for materials to oppose the flow of electric charges.
One example of a positive feedback loop in childbirth is contractions. When the contractions start, they produce oxytocin, which stimulates stronger contractions, which produce more oxytocin.
