A niche is the role a species plays in the ecosystem. In other words, a niche is how an organism “makes a living.” A niche will include the organism's role in the flow of energy through the ecosystem
Descriptive investigations involve collecting data about a system, but not making tests or experiments.
Making tests belongs to experimental investigations.
Descriptive investigations aim to draw conclusions from observations of the fenomena, while experimental investigations design tests that let the researcher to compare results on different conditions with a control situation.
There is also the so called comparative investigations which collect data from under different conditions but do not include the control situtation.
Answer:
The residual and institutional models are two different approaches to providing aid to citizens in a society. The residual approach focuses more on providing aid only in dire situations to the most needy, while the institutional provides support as a normal aspect of life to all in society.
Explanation:
A major contribution of the psychoanalytic theorists is
insight into human beings and their psyche. Psychoanalytic theory shows that humans
are driven by the need to gratify their basal and instinctual need. It posits
that humans are not masters of their own destiny but rather slaves to their
instinctual needs.
