The body uses specific methods to address pathogens that are causing illness. what are some of the body’s nonspecific defenses against invading pathogens?
a.
antibiotics
c.
antibodies
b.
mucus, sweat, and tears
d.
killer t cells

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Suppose you use three different scale to weigh a bag of oranges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of oranges is 2.153 lb. which of the following best decribes these results?