The smallest increase or decrease in a physical stimulus that you can detect at least 50 percent of the time is called the _____ difference

Depression and mania have been linked to ______

a. hormonal imbalances c. neurotransmitter imbalances b. lymph node disorders d. motor cortex malfunctions

In vitro fertilization is a possible alternative technique for conception

A) in which embryos are frozen for several years and then placed directly into a substitute mother's uterus. B) involving the implantation of a fertilized egg into the uterus of a substitute mother who delivers the baby. C) in which a male donor's frozen sperm are thawed and placed directly into a woman's uterus. D) that involves uniting sperm and egg in a petri dish and then placing several embryos in the uterus.