Answer:
nitrogen gas and oxygen gas.
Explanation:
78% of earths atmosphere is made up of nitrogen and 21% is made up of oxygen.
<span>1they live in In the north of the amazon rainforest : south America.
2they eat a</span><span>nything that they can collect in the forest ... EG. animals, berry's, nuts , seeds , flowers , plants and anything that they can really find / forage for
</span><span>3The Tucano are a multilingual people because men must marry outside their language group; that is
4no man may have a wife who speaks his language, for that kind of marriage relationship is not permitted and would be viewed as a kind of incest.
</span><span> 5 the Tucano practice linguistic exogamy
</span>6<span> They are usually described as being made up of many separate tribes</span><span>, although the appellation is somewhat problematic due to the complex social and linguistic structure of the region
7</span> <span>The Tukano recognize 137 varieties of manioc
8 the tukano </span>tribe<span>, which extends into Brazil and is the largest group
9</span>They<span>'re never the </span>work<span> of committees of living individuals
10</span>The Tukano<span> are 6,000 people living in the border with Colombia and Venezuela</span>
The main mechanism through which the layering happened is gravity: it pulled the heavier, denser material to the center, leaving the less dense material on the surface.
The material that was on the outside cooled quicker, but this was the result, not the cause.
The answer is
<span>2) Gravity caused more-dense material to move toward the center of each planet.</span>
