You are a molecule of carbon. Choose a starting point in the carbon cycle and describe the process you would go through to move through the entire cycle.

My journey began when I was used as energy for plants during photosynthesis. I helped the plants, but also helped the animals who ate the plants I was in. I am glad I was able to help those animals, but I have no idea where I am now.

I had been trapped for thousands of  years it felt like. I guess the animals left me when they were done with me. Now I'm being used as some fossil fuel, and then I'll be back to starting the process.

Explanation:

I did this not even a week ago, so I'll just give you my answer

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

the answer to your question is tooth decay.