Arat having to press the lever a certain number of times before it would receive the pellet of food is an example of which of the following?
a. fixed ratio
b. variable ratio
c. fixed interval
d. variable interval

Explain how unhealthful weight loss or weight gain can lead to further weight loss or weight gain.

Which safe and legal options do teen parents have if they think they are not ready to be parents? check all that apply. leave the baby in front of someone's door. surrender the baby under their state’s safe-haven laws. place the baby for adoption. release custody to the baby’s grandparents. give the baby to a stranger.

Which of these are fast-acting compounds that attack ocygen-dependent tissues known to be particularly sensitive to these compounds? a.nerveb.vesicantsc.cyanide compoundsd.pulmonary