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.
The body's most important nonspecific defense against pathogens is the skin. The nonspecific defense system in the body guards against keeping infections from the body. Some of the nonspecific defenses are tears, mucus, and sweat among others. The correct answer will be D.
Answer:
Cell is the most basic unit of any organism, smallest unit of life that can function independently and perform all the necessary functions of life, including reproducing itself. All living organisms are made up of one or more cells. The cell is the smallest thing that is alive.
Explanation: