100 points what is the main way the skin prevents pathogens from entering the body?
a) by fighting them
b) by acting as a barrier
c) by creating immunity against them
d) by triggering a response in the brain

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

Four types of motile cells in human body?

Which identifies the main purpose of biological taxonomy?