Events involving a disk-shaped nebula occurred before the nuclear fusion that led to the birth of the solar system. which two statements about the disk-shaped nebula are true?

1.gravity caused the disk-shaped nebula to shrink.

a cloud of gas and dust started to shrink or more corectly started condensate, due to the force of its own gravity. this process started slow, but increased in velocity as more material were moving toward the center.

2.rotational motion caused the nebula to flatten out in its disk-like shape. the nebula spined counterclockwise to conserve the angular momentum of the material of the material that were going to the center. this rotation, made the materials that were not in the center flatten out, that's why it looks like a disk.

i think the answer is c hope this

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.