Your heart beat reflects... O How many times you cough
O The amount of blood contained in your heart
O How much oxygen your body needs
O Veins carrying oxygen
O Other:

Why do carbohydrate molecules function so well as fuel for the body?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

How does the carbon cycle involve an exchange of carbon