Asymbiosis in which both species benefit is
a. predation
b. commensalisms
c. mutualism
d. parasitism

option a and d is the correct answer

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if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

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.