Who's bored bored bored right now, anyone want to talk.

What best explains the inability for life to exist in earth early atmosphere

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided