Seventy-five percent of the earth’s biomass is contained in a.)forests b.)oceans c.)grasslands d.)deserts

it is actually forests so a

a. forests

A biomass can be defined as the quantity or amount of living matter available in a given habitat. The living matter refers to the number of animals, plants and microbes present in a location that interact with each other in a food chain. The forest cover of the earth is 31% it includes diversity of living organisms not found in an other biome such as oceans, grasslands and deserts. Forests are ideal habitat that provide resources like water, shelter, food, mates and others that supports the existence of large number of lives. Therefore, Seventy-five percent of the Earth’s biomass is contained in  forests.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.