From which layer of the atmosphere do particles of air escape into space? A.)exosphere

B.)troposphere

C.)mesosphere

D.)stratosphere

Children begin to use tools at about what age? a. 18 months b. 2 years c. 1 year d. 6 months

What factor contributed most to the beginning of the women’s rights movement in the united states during the mid 1800s? a dramatic increase in women’s participation in the workforce b a shift in social attitudes brought on by increased sectional tensions c the experience of gender discrimination within reform movements d the granting of voting rights to african american men

Which of the following  bestillustrates a negative reinforcer?               a.  copland gives up candy to stave off chronic acid indigestion.    b.  nancy learns that she prefers chocolate over vanilla.    c.  carmine changes his major to english lit after failing a math exam.    d.  on a hot day, lindberg always drinks lemonade.