PLEASE HELP :) please explain:

What is a mutation?
What effects can mutations have on an organism?
Are most mutations harmful or harmless?

thanks!!

Actinobacteria sp. are fermenting organisms (which do you use oxygen to breathe) referred to as chemoorganohetereotrophs this means they break down organic material and convert it to inorganic material. which part of the carbon cycle does this describe

Which rate indicates the number of children that would be born per women if she were to live to the end of her child-bearing years

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b.hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.