Answer:
Emigration : The act of leaving one's own country to settle permanently in another; moving abroad.
Immigration: is the international movement of people to a destination country of which they are not natives or where they do not possess citizenship in order to settle as permanent residents or naturalized citizens.
Explanation:
Answer:
Vertebrae
Explanation:
both birds and reptiles have a backbone or a <em>vertabrae. </em>therefore they are Vertebrates.
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D. A change in the amount of polar ice will alter how ocean currents move
Answer:
Explanation:
So that it can be better for the person
The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.