bacteria fall under biology
Marine biology would be in the agriculture/natural resources career cluster, or possibly under the biology/science career cluster.
Bacteria are unicellular prokaryotic microorganisms and so come under microbiology.
There are actually 10 fields: Biology, Physiology, Ethology, Botany, Zoology, Herpetology, Iohthiology, Paleontology, Microbiology, and Biochemistry.
life science cxan be divided into branches , the diffrent fields of study often overlap.
Not a very clear question, but I will try. Biology is biology. Yes there are many diverse topics in the field of biology, but they are all "united" under the field of biology. If you were looking for a single theory that unites all the disciplines of biology, that would be the theory of evolution... that much has been more eloquently put by T. G. Dobzhansky: http://en.wikipedia.org/wiki/Nothing_in_Biology_Makes_Sense_Except_in_the_Light_of_Evolution
Normally this would come under biology, However many bacteria are involved in geological processes (e.g. stromatolites) and it has been found that bacteria live deep down in the rocks of the planet. Thus were bacteria are involved in this way their study would be of concern to the earth scientists too.
Microbiology is an area under the general science of Biology. It deals with the study of microorganisms (bacteria, fungi, viruses etc).
Biology.
Marine biology would be in the agriculture/natural resources career cluster, or possibly under the biology/science career cluster.
Either chemistry or biology.
Veterinary medicine is its own branch of science, but it comes under both the medical sciences and zoology, a division of biology.
Bacteria are unicellular prokaryotic microorganisms and so come under microbiology.
Endocrinology, which is part of human physiology, which is in turn part of human biology, which falls under general biology.
The study of the natural world falls under the broad category 'natural sciences'--these include biology, physics, geology, astronomy, earth sciences, among others. It can also include non-hard sciences, such as history.
Yes under the branch of biology and physiology.
There is Physics, Biology, chemistry, and Astronomy. Under each of these categories there are many sub-categories, like quantum physics and oceanic biology.
Earth science