geosphere - The solid parts of the earth., biosphere - the worldwide sum of all ecosystems. It can also be termed the zone of life on Earth., hydrosphere - the water found on, under, and above the surface of a planet, atmosphere - the layer of gas, or layers of gases that envelop a planet, and is held in place by the gravity of the planetary body, ecosystem - a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life that interacts with each other and depends on each other., mitochondria - cell organelles that generate most of the chemical energy needed to power the cell's biochemical reactions., organelle - a subcellular structure that has one or more specific jobs to perform in the cell, much like an organ does in the body, cell wall - An outer protective layer in many cells including plants, fungi, algae, and bacteria. It functions to provide structure, support, and protection for the cell., cell membrane - A lipid bilayer that is a barrier that keeps the constituents of the cell in and unwanted substances out. It also acts as a gate to allow transport into the cell of essential nutrients and movement from the cell of waste products., cytoplasm - the gel like substance inside cells that the organelles are in,

Spheres

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