Marcus was asked to find out what affects the strength of electromagnets. He was given a simple electromagnet made from a coil of wire and a power supply. What variables could Marcus investigate?

current passing through wire

number os turns on core

the nature of the core material

the shape and size of the core or the material

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