I think this is called relative dating...............
6:
•picture on the left is a sperm cell, thing labelled is the TAIL
•picture on the right is a bacteria cell, thing labelled is PILI
7:
cilia are short hairs that are on cells where as flagella are very long hairs
therefore the structures below are FLAGELLA
Answer:
<h3>The genes that caused scales to become feathers in the early ancestors of birds </h3>
I think the answer is F. Water pollution
Hydrogen bonds a protein with no quaternary structure a protein