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.
The main function of the small intestine is absorption of nutrients and minerals from food.
EARTH'S PROTECTIVE SHIELD. Earth is surrounded by invisible gases that form a thin protective blanket that we call the atmosphere. It contains the oxygen that we breath as well as other important gases such as nitrogen, carbon dioxide, water vapor, and ozone.
It helps get rid of carbon dioxide.
Took me a while to understand any of this XD
Hi there!
The stage after Protostar would be - Sequence Star.
Hope this helps you!
~DL