If internal conditions change to any great degree,illness results.This makes the study of homeostatic mechanisms medically important.
A.so that the experiment is cheaper and easier to conduct
b.so that a specific problem can be solved as quickly as possible
c. so that no one else will know what is being studied
d. so that they respond to the test as they would normal conditions
Answer:
Transcription factors
Explanation:
They are part of the cell's core transcription toolkit, needed for the transcription of any gene. RNA polymerase binds to a promoter with help from a set of proteins called general transcription factors.
New matter is not created because matter can neither be created nor destroyed (or so is said) where the matter comes from is from the matter it takes in such as sunlight, nutrients, water, and carbon dioxide, hope i helped.
Population decreases by 15.
Birth rate means more population (positive), death rate means less population (negative), immigration means more (positive), and emigration means less (negative). So, just add and subtract the appropriate numbers:

Negative 15 people means that the population decreases by 15.