What are early warning signs that a romantic relationship might become violent? check all that apply?

What type of specimens where you able to see under each of the microscopes in the microscope activity

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time