Which statements best describe fossils? Check all that apply. They only show evidence of living species.
They are the preserved remains or evidence of organisms.
They can show how organisms have changed over time.
They do not show relationships between organisms.
They can help scientists identify extinct species.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.