Someone please help fast! What information can tree rings give us about past climates?

Select 2 correct answer(s)

A. Past temperatures

B. Past cataclysmic events like asteroid impacts

C. Past precipitation levels

D. Past atmospheric CO2

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

How can an organ, such as the lungs, work for multiple body systems?