In biology, the inner lining of tubular structures is called a lumen.
This can refer to numerous tubular structures in the body, such as the lumen of the veins and arteries, the lumen of the intestines or the tubes in the kidneys.
This term can also be used to describe a space defined by membranes of cell organelles such as the lumen of the mitochondria, the Golgi apparatus, and others.
Answer:
Whenever matter moves from one sphere into another, some process, driven by energy, causes it to happen. Here are some examples: Water moves from a river (hydrosphere) into the air (atmosphere) by a process called evaporation.
Explanation:
A relationship in which two or more species benefit is called a mutualistic relationship.