<span>B. organ systems, organs, tissues, cells
Organ systems are the most complex in this grouping, they are made up of multiple organs, tissues and cells all working together with other organ systems to keep an organism alive. Examples of organ systems are the digestive system, respiratory system, nervous system. Organs are groups of tissues and cells working together with a main purpose. Examples of organs are heart (pumps blood), brain (controls the body), stomach (digests food). Tissues are groups of cells working together as a whole such as cardiac tissue, adipose tissue and blood. Cells are the smallest unit of life, in groups they form tissues and organs. Cells of the body include neurons, blood cells, skin cells, and fat cells.</span>
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Jet streams are like rivers of wind high above in the atmosphere. These slim strips of strong winds have a huge influence on climate, as they can push air masses around and affect weather patterns. ... Temperature also influences the velocity of the jet stream
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