Because they figured out that other animals don't drag their tails.
At the end of the brain stem
The bottom end ends in the region where the lower back, or lumbar spine
Hope that helps, Good luck!
Answer:
Explanation:
Each type of muscle tissue in the human body has a unique structure and a specific role. Skeletal muscle moves bones and other structures. Cardiac muscle contracts the heart to pump blood. The smooth muscle tissue that forms organs like the stomach and bladder changes shape to facilitate bodily functions.
They are are in your respiratory system and the are there to help you breath and you forgot avolli
Correct answer: B). With fewer contractions
The main function of a contractile vacuole is to maintain the sufficient amount of water in the protoplasm of the cell. For the freshwater amoeba contractile vacuole is needed to pump water and maintain a osmoregulation.
But when it is kept in sea water, more contraction is required to expel the water out of the cell in order to make the environment inside amoeba same as of sea water.
