Which of the following statements are true about gravity?
select all that

a. gravity exists only on earth

b. gravity is the force that holds the moon in orbit around the earth

c. gravity is a force that pulls two or more objects together

d. gravity exists between two or more objects, but only when they're close enough to affect eachother

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

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