The first organisms on earth may not needed oxygen. Today, many plants and animals on earth require gas exchanges in the carbon dioxide-oxygen cycle to

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Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature above 37 degrees celsius (98.6 degrees f)? describe what might happen if the temperature decreased by 10 degrees celsius.

What would happen if the krill were removed from the food web