Respond to this statement: “If we are not careful, how will the earth run out of water?” (At least a 100 word response)

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

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans