The exchange of segments of DNA(crossing Over) between the members of a pair of chromosomes
A. ensures that variation within a species never occurs.
B. acts as a source of variations within a species,
C. always produces genetic disorders,

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.

the answer would be   10%