Salutations!
<span>Cells that perform similar functions combine to form: ----
</span><span>Cells that perform similar functions combine to form: tissues. A group of tissues working together combine to form an organ system. Organs working together combine to form an organ system. Organ system performing their functions makes an organism.
Thus, your answer is option D.
Hope I helped (:
Have a great day!</span>
Species change over time. -The mechanism that produces the change is natural selection: the differential survival and reproduction of individuals based on variation in their traits. Natural selection acts on individuals but individuals do not evolve; their descendants do.
Answer:
1.) DNA Fingerprinting- a positive out come of this is when some one commits a crime and leaves finger prints they can be used to find the person who committed the crime
Electron pairs , because the atoms become stable by gaining the electron pairs
