Why would a teacher say that meiosis is actually mitosis happening twice?

In what for do plants utilize nitrogen? why do they need nitrogen?

What is the role of dna ligase in the elongation of the lagging strand during dna replication?

Choose the best definition of allele. a. one of several possible versions of a gene, which each produce a different phenotype b. an organism that's purebred for a given trait c. the process of fertilizing a plant with pollen from another plant d. a set of genes that are located on the same chromosome and so are tightly linked