1. is A i think
2. is B
3. is D
4. is D
DNA = thymine, Guanine , adenine and cytosine .
RNA = thymine ,uracil,guanine ,cytosine
Each one performs a specialized task for the cell. If they were without even one, the cell would die.
Answer:
b: physiological adaptation
Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots isos and topos, meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.
