How, if at all, does an action potential change as it travels?

a. It increases in strength.
b. It decreases in strength.
c. It increases in speed

Adolescents and many young adults are confined to formal operations and do not possess post-formal operational thought because, according to Gisela Labouvie-Vief, they lack ____

the better coordination of sensory input with motor skills || the disappearance of egocentric thought and animism. || a greater recognition and incorporation of practical limitations to logical thinking || a greater use of hypothetical and inductive reasoning for concrete problems || || ||

Which of the following statements about childhood immunizations is true?

A) The United States is ahead of Australia, Denmark, Norway, Canada, the Netherlands, Sweden, and the United Kingdom in immunization rates. B) Overall, 17 percent of U.S. preschoolers lack essential immunizations, and the rate rises to 22 percent for poverty-stricken children. C) Nearly 100 percent of U.S. children who receive a complete schedule of vaccinations in the first two years continue to receive the immunizations they need later, in early childhood. D) Disease outbreaks of whooping cough and rubella have not occurred in the United States since the development of vaccines for these diseases.