I think it's a Biologist.
It is the idea that life as we know it all descended from one ancestral life form.
"biologists"
an ecologist
1) All of them come from another life form. 2) All of them require water. 3) All of them require food in some or other form. 4)They all respire. ( They all use oxygen or oxidation process to get energy, required for metabolic activity. ) 5) They all have DNA. (RNA, if you consider viruses as a living being. ) 6 ) All of them grow. 7)All of them get old. 8) All use food for metabolic activity. 9)All of them form end product/products of metabolism. 10)All of them contains Carbon,Hydrogen,Oxygen and Nitrogen. 11)All of them reproduce. ( Even at the cost of there own life.) 12)All of them die, eventually.
A biologist studies all life forms.
Ecologists
marine biologist
biologist
marine biologist
scientist
pain for all success studies
A Naturalist
all life sciences .
scientist
Life Studies was created in 1959.
a zoologist studies ALL animal life, environments, behavior, sickness, and there circle of life