Which change to one of the kits would make it useful for modeling proteins? a. Set 1, add a box for phosphorous (P) atoms. b. Set 2, add a box for sulfur (S) atoms c. Set 3, replace the box of phosphorous (P) atoms with a box of sulfur (S) atoms d. Set 4, replace the box of oxygen (O) atoms with a box of nitrogen atoms (N)

The correct answer is - option C.

Explanation:

Proteins are made up of long chains of polypeptide chains made up of amino acids contain the basic elements of organic matter carbon, oxygen, and hydrogen with the addition of nitrogen.

In the given option set 1, and set 2 lacks the nitrogen elements whereas in set 4 the oxygen is not available, and set 3 have all the elements required for the protein.

Thus, the correct answer is - option C.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.