Which statement describes all enzymes?
a. they control the transport of materials
b. they provide energy for chemical reactions
c. they affect the rate of chemical reactions
d. they absorb oxygen from the environment
explain why.

Option C.

Explanation:

Enzymes are defined as the macromolecular that act as biological catalysts which helps to accelerate chemical reactions.

Enzymes increases the rate of chemical reaction by lowering its activation energy. Enzyme can exceed the rate of reaction million times faster..

The molecules at which enzymes act are called substrates, and substrate is converted into several other molecules are called products.

Several metabolic pathways depend upon enzymes that catalyzes every single step of reaction. Enzyme activity majorly affected by other molecules named inhibitors and activators. Inhibitors inhibits or restricts the activity of enzyme while activators increases the activity of enzymes.

Hence, enzymes affect the rate of chemical reactions.

good thing- during decomposition the organic molecules in organic matter are broken down into simpler organic molecules that require further decomposition or into mineralised nutrients

bad thing- it can be harmful in crop productivity