Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
Answer:
Please list the statements there are to choose from, this way, even people outside your school and/or grade level will be able to answer your question.
Explanation:
Bodily functions that help keep it stable. Like sweating when your are hot keeps your body at a cooler temperature rather then burning up.
It is called hydrosphere
It is the total water in Earth.