What are reactants in a chemical reaction?(1 point) A. outputs
B. inputs
C. substances that are formed by reactions
D. substances that speed up reactions

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

How do living things obtain phosphorus

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.