HELP PLEASE it’s the last day of school:((

What is an important step to prove something is valid or not? determining the reliability observing research testing

Which is a contraceptive method that is classified as hormonal birth control?

Which description best defines the nervous system and its two main branches? a: the message center of the body, split into the autonomic nervous system and the somatic nervous system b: the control panel of the body, split into the central nervous system and the exterior nervous system c: the message center of the body, split into the central nervous system and the peripheral nervous system d: the control panel of the body, split into the brain and the spinal cord