Animals depend on food and without food it will break our animal food source chain. for example cows depend on hay and lions depend on meat from cows or something like that
The process is photosynthesis.
I’m not 100% sure because I’m pretty dumb when it comes to science but I’m pretty sure the answer is either B or C
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.
Scientists often use models because the real thing many be to dangerous or impossible to work with. The most important that model helps better then visualization and you can see it right in front of your eyes.