: For the DNA sequence below, what is the complementary DNA sequence? *
GTACCAT
O A-A-T-C-G-G-G
O G-G-G-C-C-C-T
O C-A-T-G-G-T-A
OT-G-A-G-C-T-C

C. C-A-T-G-G-T-A

Explanation:

because

A=T  G=C  C=G  T=A

and this above is the answer key to all DNA complementary strands.

The answer is: beans and whey protein

The most abundant element in the atmosphere is nitrogen N2 (~78%), followed by oxygen O2 (~21%).

CO2 makes up less than 1% of the atmosphere. Much less for that matter.

The key to the question is knowing that protein contains nitrogen.

Protein is a macromolecule made up of smaller molecules called amino acids. Amino acids are made up of a central carbon (C) and 4 groups:
     amine (-NH2)
     carboxylic acid (-COOH)
     a hydrogen (H)
     a side chain which is different and specific to each amino acid

One can infer amino acids contain nitrogen from their name (amino).

Beans contain a high amount of protein, and whey protein is a type of protein, so both contain nitrogen.