Which is the best correction of sentence 2?

Our muscles might hold the answers, they tell why our bodies don't burn off the pizza and ice cream as fast at 70 years old as they did at 25.
This is a complete sentence; therefore, it doesn't need to be corrected.
Our muscles might hold the answers our bodies don't burn off the pizza and ice cream as fast at 70 years old as at 25.
Which is the best correction of sentence 3?

One of the primary reasons is that we lose muscle cells, as we age the older we get, the harder it is for the body to maintain muscles.
One of the primary reasons is that we lose muscle cells as we age the older we get, the harder it is for the body to maintain muscles.
One of the primary reasons is that we lose muscle cells as we age; the older we get, the harder it is for the body to maintain muscles.
Which is the best correction of sentence 4?

For example, my great aunt has always weighed 115 pounds and the percentage of muscle in her body, unfortunately, has not stayed the same.
For example, my great aunt has always weighed 115 pounds the percentage of muscle in her body, unfortunately, has not stayed the same.
For example, my great aunt has always weighed 115 pounds; however, the percentage of muscle in her body, unfortunately, has not stayed the same.

1 answer

Here are the best corrections for each of the sentences:

For sentence 2:

Corrected: "Our muscles might hold the answers; they tell why our bodies don't burn off the pizza and ice cream as fast at 70 years old as they did at 25."

For sentence 3:

Corrected: "One of the primary reasons is that we lose muscle cells as we age; the older we get, the harder it is for the body to maintain muscles."

For sentence 4:

Corrected: "For example, my great aunt has always weighed 115 pounds; however, the percentage of muscle in her body, unfortunately, has not stayed the same."

These corrections address punctuation issues, improving clarity and grammatical structure.