They dont release any oil
they "preen" their feathers with their beaks not put oil on them
Active transport. Which the molecules are transported by a protein called carrier protein with the help of ATP.
The correct answer is B !! Both are interdependent thus forming a mutualistic association !!
As both can not live without each other thus making obligate !!
so They share obligate mutual association !! Go with B !!
What holds the two strands of DNA molecules to each other. Hydrogen Bonds
