Waldo is discussing climate change with Sarah. He says that the sun is the only cause of climate change and it has nothing to do with CO2 and humans. Sarah disagrees, and says that temperature is closely related to the amount of CO2 in the atmosphere. Which friend's claim is supported by the evidence presented in this lesson? Be sure to describe how the evidences proves that friend's claim.

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

Time ! for a smell to begin the process of registering in your brain, first you must a) inhale odor molecules into the nasal cavity b)transduce scent chemicals c)have a scent to inhale d)all answers can work

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain