Explain the type of behavior involved when the bell rings at the end of class

Conditioning is the type of behavior involved when the bell rings at the end of class. Conditioning is a behavioral process in which a given stimulus or signal (such as a bell) becomes more frequent and effective in causing the manifestation of a desired response in a given environment.

they are known to reach a speed of 21 miles per hour

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).