Asmall polar molecule enters a cell with from a membrane protein. no
additional energy was needed to complete this process. what type of
transport is this?

i think the miocene epoch spans the time from 23 million to 12 million years ago.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

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