Answer:
archipelago Is the correct answer I am guessing you are in 5th grade like me I do calvert academy and correct answer is archipelago!
Explanation:
An artificial heart has been altered by man in some way. Like if they had a valve replaced it becomes artificial.
Mass..... mass measures the amount of matter in a substance or object
An area with unifying characteristic is called as a region. The region is a broad geographic area, which is differentiated from other because of the similar features. In a region one or more than one types vegetational climax might be present. It is the continuous and extensive part of the surface. The area in a region is indefinite.
Hence, the given blank can be filled with region.
