Answer: i'm pretty sure it's b if i remember correctly.
Explanation:
i learned this a while ago so i'm not completely sure.
A material source utilized in research, as diaries or manuscripts. Hope this is the answer
it would be 26 because once you divide 160g by 5.0g and add 12.5 you would get 26
hope this helps
The 3 parts are
1) A five carbon ribose sugar
2) A Phosphate molecule
3) The four nitrogenous bases
I hope that's help !
The answer is c, because we use it as an "index" to tell when the animal lived, so if it's unique to that time level in the ground we know it lived that long ago.
