A collection of thick mucus in the cervix that prevents bacteria from entering the uterus is known as a(n) ____

Which factor contributes to the decline in neighborhood play among children?

A. people no longer want to know their neighbors B. parental obesity C. the high incidence of juvenile diabetes D. a scarcity of vacant lot and empty fields

Brain is to __________ as spinal cord is to __________

a. central nervous system; peripheral nervous system b. sensory nerves; crainial nerves c. meninges; ventricles d. cerebrospinal fluid; meninges e. skull; vertebrae