A0 are the smallest biological structural units of the body.

The correct answer for the blank is-

Cell.

Cell is the smallest biological, structural, and functional unit of all life forms ( such as plants, animals, and bacteria). In other words it is the basic unit of all life forms as all the living organisms are composed of cell.

Cell can exist independently and performs all the cellular processes ( metabolic processes)  that are necessary for the survival.

Thus, cell is the right answer.

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."