Why do the planets not travel in a straight path?
a.) the forces of inertia and gravity cause them to move in a elliptical orbit around earth.
b.) the forces of inertia cause the planets to move in curved paths around the sun.
c.) the forces of gravity and inertia combine to produced elliptical orbits around the sun.
d.) all of the above

The zone, which exists from a depth of 0 to 600 feet, is home to the majority of ocean life.

For each of the following, decide whether the statement describes photosynthesis, cellular respiration, or both. releases energy in the form of atp. stores energy in glucose molecules. performed by producers. performed by consumers.

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.