Biology
noun
Remember how 生物 means "living things?" Well when you study living things you're studying biology.
せいぶつがく
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
学校で生物学のクラスが一番楽しいです。
I enjoy biology classes the most at school.
川田さんは生物学の学者さんです。
Mr. Kawada is a biology scholar.
デザイナーになりたいなら、生物学も学んだ方がいい。
If you want to become a designer, you should also study biology.