How did arhropods evolve?

Arthropods represent the evolutionary pinnacle of the protostomes. It seems likely that arthropods evolved from the same root as the annelids and that the three main lineages of arthropods - the Chelicerata, the Crustacea and the Insecta - evolved independently from a common ancestor.

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.