Why is nitrogen important to all living things? A. It is found in nucleic acids.
B. It is found in lipids.
C. It is found in all organic compounds.
D. It is found in carbohydrates.

When water freezes, it . contracts expands

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

In a cladogram' when does a group of organisms branch off