Gravity is a force that attracts objects together. For the pull of gravity between two objects to be noticeable,
A.
one of the objects must be made of metal.
B.
the objects must have opposite charges.
C.
at least one of the objects must be very large.
D.
special glasses must be used.

We all have different forms of genes from our parent(s).what are these different forms called? a.alleles b.characters c.dna d.resources

In two sentences explain the differences of neutrophil and macrophage

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water