What do saliva, tears, and nasal mucus have in common?

all can be classified as biological barriers.
all contain langerhans cells.
all can destroy bacterial cell walls.
all are part of the complement system.

An example of maslow's need for safety is reaching goals through self-discipline

George’s daughter was born with a hole in her heart. he met up with a group of individuals of questionable character who agreed to deliver to george a healthy heart that could be a transplant for his daughter for a sum of $20,000. the group george negotiated with failed to deliver the heart. george tried to sue when he did not receive the heart but was surprised when the courts would not enforce the agreement.can george force performance of this contract? why or why not? (10 points)will he be able to recover the $20,000 that he gave for the heart? why or why not? (10 points)

Aperson has had a good _ of life if they are still at the age of 95.