Science

Zoologists are required to have a minimum of a Bachelor's degree in a field such as zoology, biology, wildlife biology or ecology with coursework in anatomy, wildlife management, cellular biology or even botany, physics and chemistry. Many zoologists specialize in certain species and so will have advanced coursework in those fields.
Some of these areas of specialization include:
1. Entomology: the study of insects.
2. Herpetology: the study of reptiles and amphibians.
3. Ichthyology: the study of fish.
4. Mammalogy: the study of mammals and
5. Ornithology: the study of birds.
Some zoologists are identified by certain aspects of zoology, such as ecologists, who study the relationship between animals and their habitats, and evolutionary biologists, who study the origins of species and the changes in the species over time.
Career advancement:
A Master's degree is needed for higher-level positions, and a Ph.D is required for many jobs, such as leadership roles in most research projects and teaching at a university because competition is so high in the job market, even lower-level jobs may go to the candidate with a graduate degree. Some employers require a minimum of a Master's degree for any job above an entry-level position.

Newton's second law of motion is F = MA. Thus, Ft = mv - mu.
Now, when F = 0, then v = u. In the absence of force, the object continues to move with same velocity throughout.
Now, when F = 0 and u = 0, then v = 0. That is, an object at rest will remain at rest if no force is acting on it. Thus, Newton's first law is derived from second law.
Now, let us consider a system of 2 bodies 1 and 2, and consider that there is no external force acting. Now, let F12 be the force acting on 2 by 1 & F21 be the force acting on 1 by 2.
The rate of change of momentum of 1 = dp1/dt and rate of change of momentum of 2 = dp2/dt. Thus, according to Newton's second law of motion F12 = dp2/dt and F21 = dp1/dt
Adding both the above equations, we get
F12 + F21 = dp2/dt + dp1/dt = d(p2+p1)/dt
We know that, no force is applied. Thus, momentum change will also be 0 because no change in velocity occurs.
Thus, d(p1 + p2)/dt = 0
Therefore, F12 + F21 = 0
That is, F12 = - F21.
Thus, Newton's third law is proved with Newton's second law.

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