What does a biology do * i need whole report on this*

I assume you meant biologist in this situation. A biologist is a type of scientist that studies living things, their environments, and how they live. Many different types of biologists exist, including research biologists, health care biologists, environmental biologists and biology educators. When it comes to research biologists they study different groups of living organisms around the world. Health care biologists are physicians, veterinarians, nurses and dentists. These types of biologists prevent spreading of infectious and deadly diseases and formulate ways to enhance the health of their patients. Biology educators teach students and up-and-coming biologists basic and sometimes advanced biological sciences in classroom, laboratory and field settings. Environmental biologists study ways to preserve the natural environments of different types of organisms. If you need an example they study animals in captivity and design new methods to help certain species live longer lives in their natural habitats.

Explanation: Hope this helps.

"do a testcross with a homozygous recessive plant."

the answer is b.) hydrogen bonds between bases.