Scientific

a. can be changed and revised

b. need to be proven only once

c. are not subject to revision

d. become laws when they are proven

i think the answer is gold im not entirely sure

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.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms