Biodiversity encompasses the number of: a. ecosystems in a region and number of species in the ecosystem. b. ecosystems in a region, species in an ecosystem, and genes and alleles in a species. c. ecosystems in a region. d. species present in an ecosystem. e. genes and alleles in a species.

b. ecosystems in a region, species in an ecosystem, and genes and alleles in a species.

Explanation:

Biodiversity has three levels - ecosystem, species and genetic diversity. Therefore, Biodiversity  can be defined as the variability among living organisms involving terrestrial, marine, and other aquatic ecosystems, genes and alleles in a species and their ecological complexes such as diversity within species, and between species of the ecosystems.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

it's the cell cycle, but cytokines is when the cell divides.

theres 3 stages interphase,mitosis,and cytokines.

interphase prepares the cell for division.

mitosis is the process of dividing the cell,it has 4 parts interphase,anaphase,metaphase,and telophase.

lastly there's cytokines,that's when the cell divides into 2 daughter cells