Without energy, molecules tend to want to move from A. a low concentration to high concentration.
B. a top of the mountain to the bottom.
C. the bottom of a mountain to the top.
D. a high concentration to low concentration​

D

explain: The Move from high concentration to low competition. Until the concentration is equal . Diffusion expand needs no energy

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."