Asubstance that influences the reaction but does not participate in thereaction is a

Catalyst

Explanation:

Catalyst is a substance that influences the reaction but does not participate in the reaction.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.