Earth is blanketed with so many species and so many different kinds of biological communities because populations have been able to adapt to almost any kind of environment on Earth through natural selection. ... To sustain life on Earth, more than the few animal and plant species used by humans must be preserved.
Answer
C. They are source of new genetic variation
Explanation
Mutation result in genetic changes allowing species to develop new traits because the DNA changes thus affecting how the living organism will behave, look and adjust to physiology processes. Through mutation, evolution has been achieved because living things can survive as they fit into new environment with new traits acquired through mutation.
Answer B is false. An element is a type of atom and you do not need to combine two atoms to get a specific element. Combining two atoms will leave you with a compound not an element.
