PLEASE HELP WILL MARK BRAINLIEST
Which best describes eras and periods?

A. Eras have a smaller time span than periods.
B. Eras and periods are independent of each other.
C. Eras and periods both appear at the start of the Cambrian period.
D. Eras were more recently established on the time scale than periods.

B or C i think

Explanation:

because Eons are broken into eras and then into periods.  Its not A tho

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products