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.

poison levels are being represented and it show how much poison the producer has and how much the consumer has   and damage the organisms in it, particularly in the predators at the end of the chain. this is because accumulating compounds cannot be excreted.

this is a good question! i'll do some research and come back when i have the answer!