How many atoms are there in a sample of lead with a mass of 6.8 g?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

What is the correct equation for cellular respiration?