The force of attraction that the earth exerts on all objects is called weight gravity inertia

Ok, its not weight because that is our own natural thing, and has nothing to do with force, so you can eliminate that.

Its not inertia because it is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force. So we can go ahead and eliminate that choice.

Gravity - the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.

So your answer would be Gravity.

Hope I helped. :)

they deliver oxygen to the blood

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.