What did Aristotle think regarding fossil shells? 1. inferred that fossils were once part of living animals
2. that geologic time cold be calculated by shell deposits
3. that sedimentary rock was formed in layers
4. that geologic time could be determine by rock strata

A

Explanation:

A later Greek scholar, Aristotle, eventually realized that fossil seashells from rocks were similar to those found on the beach, indicating the fossils were once living animals. ... These were fossil shark teeth, thought by some classical cultures to look like the tongues of people or snakes.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.