How can grouping lead to increased survival rates

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

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )