Choose all the answers that apply.
venus:
rotates from east to west
has no moons
is the hottest planet
is similar in size to the earth
has the most circular orbit of all the planets

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

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.