Answer:
A
Explanation:
A(adenine) form 2 hydrogen bond with T(thymine)
G(guanine) form 3 hydrogen bond with C(cytosine)
<span>Normal urine has a specific gravity that is higher than the specific gravity of pure water; dehydration leads to an increase in the specific gravity of urine.</span>
3: B Nervous system. 4: A Sensing and responding to its external environment.
Well I won't go to tooooooo much of that detail but the thing is FACT BY ME that everything around u is science and when u learn about ur surroundings it is science...!!!!