There is a scientific research group that runs a program called the SETI program (Search for Extra Terrestrial Intelligence).
I do not know that there is a branch that deals with the subject, as most extra terrestrial life is just speculation.
Biology is the branch of science that is the study of living things.
Biology
endocrinology
Microbiology is concerned with the study of organisms that are too small to be seen by the naked eye. These small organisms are called micro-organisms. E.g. :- bacteria, algae etc.
It would be called xenobiology if any such life forms existed (and they may, but).
wich branch of physiolgy and medicre is concerned with hormones
Environmental Science is a branch of Biology that is concerned with the relationship between the organisms and their environment.
Chemistry is the branch of science concerned with the properties, composition, and structure of matter.
Biology is the branch of science that is the study of living things.
physics.
Optics.
Metallurgy
That branch of science is called thermodynamics.
Biology
the branch of Biology concerned with the relations between organisms and their environment
biochemistry is in the life science branch
biochemistry is the branch of science concerned with the chemical cocerned