The type of waste in most landfills is a-solid waste b-compost c-toxic waste d-radio active waste

a- solid waste

A landfill is a disposal area where solid waste is disposed on the land or buried inside the land. The waste is covered with the soil, to allow the degradation of those wastes inside the girth. The solid wastes consists of municipal solid wastes, including garbage coming from homes, schools, hospitals and others, industrial waste and sewage waste. These solid wastes are commonly found in landfills.

answer: 45

explanationyou have to add as well to be it could be

cell/ tissue/ organ/ organ system/ body