Answer: A closed ecological system for an entire planet is called an ecosphere.
Explanation: A closed ecological system for an entire planet is called an ecosphere. Man-made closed ecological systems which were created to sustain human life include Biosphere 2, MELiSSA, and the BIOS-1, BIOS-2, and BIOS-3 projects.
Because they make up the body and have various purposes
Clastic<span> sedimentary rock forms when sediments are buried, compacted, and cemented together by calcite or quartz.</span>