How are changes in the earth similar to changes in human beings

Many changes in humans and in earth both take time to show up.

Explanation:

When earth came into its existence it was not in of today's condition. It takes millions of years to shape and form to look like now. Go through a very slow evolution human being has come into existence. Geophysicist and astronauts suggested that earth was in a form of fire ball. It was revolved in the space very fast and suddenly get detached from ring of fire and cooled down took the form of a planet.

Likewise humans also undergone many evolution. Humans were not used to stand on two feet. They crawled like baby. Thereafter, evolution of species and today's homo sapiens came into existence.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.