To put it simply, a scholarship is when a college or uni will pay for you to come to their school. Meanwhile a loan is the money you borrow for something, which will make you in-debt
It occurs when the size of a population is severely reduced.
No it is not,
Scientific models are used to explain and predict the behaviour of real objects or systems and are used in a variety of scientific disciplines, ranging from physics and chemistry to ecology and the Earth sciences.