Plzzz help A librarian wants to yo knows what genres of books are most popular. He looks up the top 10 checked out books in the library’s computer system is it a observational study or a survey or a experiment?

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

When a gasoline engine burns gasoline, what type of chemical reaction is occurring?