Answer:
He did research in genetics.
Explanation:
Genetics is qualities, hereditary variety, and/or heredity in living creatures. It's the largest field of science, however, meets every now and again with numerous other life sciences and is firmly connected with the investigation of data frameworks.
You need to add a picture so others can understand what you are asking.
Caverns are mostly formed in limestone.
It is heated up to get rid of any killing germs that can harm you. Cows or any milk giving animal don’t always give bacteria free milk.
A tissue, If you would like to know the whole classification it would be cell-tissue-organ-organ systems-human.