Which situation is a result of crossing-over during meiosis? A
Genes are duplicated exactly, ensuring that offspring will be
identical to the parents.
B
Chromatids thicken and align themselves, helping to ensure
genetic continuity.
с
Genes are rearranged, increasing the variability of offspring.
D
Chromatids fail to sort independently, creating abnormal
chromosome numbers.

C

Explanation: Genes are rearranged due to crossing over and offspring can vary in traits and appearance

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.