True or false parent material can only be made from sedimentary rocks

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Electrons are extremely important to what area of technology? a) anti-aging research b) household product development c) electronics d) drug discovery

The excretory system,need answers for all: )