Which of the following is not one of the biogeochemical cycles considered of particular importance for organisms? A. carbon B. hydrogen C. nitrogen D. phosphorus E. water

Hydrogen

Explanation:

The biogeochemical cycle which is not that important for the living organism is hydrogen cycle.

The other cycles such as carbon, nitrogen and phosphorus cycle is very important as it provides important nutrients to the plants and animals for the healthy life.

The hydrogen cycle is not important because it is required in very small amount that it is not as important as other biogeochemical cycles.

answer; ///(b) it is composed of four protein chains and four heme groups;

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.