What is a catalyst and how do they help with the chemical reactions needed for metabolism?

See explanation

Explanation:

A catalyst refers to any substance that increases the rate of a chemical reaction. A catalyst does not affect the equilibrum position rather it enables the system to attain equilibrum faster.

Biochemical catalysts increase the rate of biochemical reactions in the body. They enable the body to carry out certain important functions that are necessary for life.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.