Answer! explain the immune systems cells and their uses.

Informal assessments are best described as a. planned, pre-made assessments developed for a specific purpose. b. scheduled observations used to gather data in preschool settings. c. unreliable observation that's only appropriate in infant and toddler settings. d. nonstandardized forms of assessment used to gather information on children's behaviors and characteristics

What are hormones? a. they are minerals needed for proper bone formation. b. they are the parts of the body targeted by endocrine glands. c. they are substances needed for muscle and nerve activity. d. they are substances released by endocrine glands.

If birth rates fall below the replacement level, then a country is in which stage of demographic transition? a. urbanization/industrialization b. mature industrial c. postindustrial d. pre-modern