Are these punctuated correctly?

Question

1.Depression is often a genetic disorder, but it can be safely treated with medication.
2.Learn the difference between an animal, a vegetable, and a mineral.

Answer 1

What are your answers?

Answer 2

I corrected the punctuation in the following sentences:
from this:
Depression is often a genetic disorder but it can be safely treated with medication.
To this:
1.Depression is often a genetic disorder, but it can be safely treated with medication.
from this:
Learn the difference between an animal a vegetable and a mineral.
2.Learn the difference between an animal, a vegetable, and a mineral.

Answer 3

Yes, you are correct.