Explain how competition can affect an organism's niche.

In interspecies competition, two species use the same limited resource. Competition has a negative effect on both of the species (-/- interaction). Two species whose niches overlap may evolve by natural selection to have more distinct niches, resulting in resource partitioning.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.