a scientist is examining the role of an element found in fatd and cabohydrates of living things this element makes up 65% of human body mass which statement describes the element he is studying?

The question is incomplete as the group of choices are not provided however the correct group of choices are given as follows:

He is studying oxygen, which can also be found in proteins.

He is studying oxygen, which is the most abundant element in the atmosphere.

He is studying nitrogen, which can also be found in proteins.

He is studying nitrogen, which is the most abundant element in the atmosphere.

The correct answer is - He is studying oxygen, which can also be found in proteins.

Explanation:

Human body is comprises of various type of molecules and elements such as fats, protein, carbohydrates and many other elements. Carbohydrates and fatty acids are are made up of 3 major elements carbon, hydrogen and oxygen.

Oxygen is an essential element with 65% of all elements found in human body it shows great affinity with proteins. Oxygen binds with hemoglobin then transferred to the through out the body.  The oxygen is also one of the elements found in proteins with other elements like nitrogen, hydrogen and carbon.

Thus, the correct answer is - He is studying oxygen, which can also be found in proteins.

answer; i believe the correct answer to the above question is ( friction)

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.