Which best describes a reference frame? a distance over which an object moves the difference between start and end velocity a position from which something is observed the average speed of a group of objects

this isn't the answer but they're the graphs

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

answer: decibel

explanation:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).