Answer:
I think this is 2 because there would have been bigger predators in the ocean vs. a lake
OK well first of all I hate biology but I like writing so you can use :: The molecular reactions of cellular respiration transform Krebs cycle into the more readily available bond energy of ATP.
Type 1 Diabetic here! I can help!! so basically the receptor for insulin is a large protein that binds to insulin and passes its message into the cell. It has several functional parts. Two copies of the protein chains come together on the outside of the cell to form the receptor site that binds to insulin.
I hope this helped :)