Help please do in 20 minutes Do you think the pulse measurements you made are completely accurate? Why or why not explian How could you improve the accuracy of your measurements?

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

Which type of fossil does this image depict?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?