The subject was geology, not biology.
They are super related.
God said that He created the heavens and the earth in the beginning—in 3 days. Then He filled the heavens and the earth in another 3 days. He said after each creation day, “there was evening and there was morning, one day. (Genesis 1-2, the beginning)
There are many good boods written by Christian scientists, but two little books that I like are:
1) “Thousands...Not Billions,” by Dr. Don De Young,
“Challenging an Icon of Evolution, Questioning the Age of the Earth”
2) “Some Call it Science,” the religion of evolution, by Henry M. Morris, PhD
Both books can be purchased from the Institute for Creation Research or any bookstore online or a local bookstore by order.