IDNStudy.com, kung saan ang iyong mga tanong ay may malinaw at konkritong sagot. Hanapin ang mga solusyong kailangan mo nang mabilis at madali sa tulong ng aming mga eksperto.

Carries materials throughout the body. Brings in-oxygen and takes away carbon dioxide. Supports/moves the body, protects some organs Changes food into a form that can be used by the body Act as a barrier to protect the body from the outside world.​