The gradual change in a species over time is called a.
mutation.
b.
evolution.
c.
migration.
d.
variation.
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B. Evolution

Explanation:

As species grow older over time they will gradually evolve through natural selection and evolution.

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

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answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;