D.
variable-ratio schedule of reinforcement.
We need classification because it is always necessary to go through different categories based on the characteristics we have so that we are able to reach the best potential answer
Answer:
<h3> definition of binomial nomenclature</h3><h3>a system of nomenclature in which each species of animal or plant receive a name of two terms of which the first identifies the genus to which it belongs in the second of the species itself</h3>
1st view --- G1 phase (growth)
2nd view --- S phase (synthesis)
3rd view --- M / cytokinesis phase (mitosis)
