What is the structure and functions of vacuum cleaner?

Which approach is the best way to confirm the credibility of a source? After waiting a few minutes while making cheese what is the solid lumpy part called? What do you call a number with 22 zeros? Which states the purpose of an experiment? Which of the scientists in question 6.a. believed in the caloric theory? How many millimeters in 500 centimeters? Are you supposed to wear socks on a random foot or are socks supposed to go on specific feet? Do the balances of gases in the air are changed when coal is burned? A substances ability to burn is an example of what? What macromoleculeles do twins have to make them look alike? Organisms living near hydrothermal vents have no access to light so they get their energy from? What is the difference between results and conclusion? When a glass rod is immersed in the colourless liquid the glass rod seems to be deappeared why? Types of research according to inquiry? What kind or energy is made from by trumpet? What is local name of coco nut tree? How do you know if you need a thermostat? What is the study of classifying things? Is building farms to grow food called a human process? What is the locomotion of spongilla?