The person who studies the way of life is called a paleontologist.
in a ecosystem
The layer containing all forms is biosphere. It is the life of all organisms.
The smallest membrane bound unit of life forms tissue in plants and animals is called is the cell.
Life forms from Venus would be called Venusians. Life forms from Mars would be called Martians. In any respect, however, there is no evidence, nor scientific support of life on either Venus or Mars.
astronauts
Obstetrecian
Ecotourism.
marine biologist
They are called specialists.
The doctor who treats the diseases of the eye is called as ophthalmologist. Now you have glaucoma specialists, cataract specialists, retina specialists and squints specialists amongst the eye specialists.
the record of life forms and geologic events in earth's history is actually called the "Geologic time scale" fine sir. good day