The question was incomplete but I managed to found it some other source. Please find that in the attached picture.
Answer:
<u>The earliest step: </u>
Formation of amino-acid building blocks
<u>The second step: </u>
Joining amino-acids into a polymer like beads on a string (this order is the 'primary structure')
<u>The third step:</u>
The first part of the protein folds due to side-chain and backbone interactions
<u>The fourth step</u>:
The final protein tertiary structure is completed with the addition and folding of the last parts of the protein.
<u>The last of these steps:</u>
The enzymatic function is possible due to the completed tertiary structure creating an 'active site' region of the protein.
The sun. This is the basis of all plant production, which in turn feeds the primary consumers, which in turn feeds the other consumers.
The plesiosaur flipper is convergent with other flipper forms becuase even though they don't share the same evolutionary path, in other words, they don't have a common ancestor with flippers, different animals reached to a simmilar structure with the same function that is locomotion in water.