This is called secondary active transport
The organs are known as Vestigial organs. The evolution from land-dwelling animal to the marine animals has led whales as well as dolphins, to lose hind limbs. The pelvic and leg bone serves no purpose in them and just provide the anchorage to muscles
It is called coevolution, when two species influence each other's speciation.
Answer:
tube 3
Explanation:
because it contains pure water
