The statement, "proportions of a population expressed in terms of the reproductive years of the individual organisms," refers to the population's

i'd say that the moon rock is about 2.2 billion years old.

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.

d. organisms have cells with different shapes and functions.