Chapter 2 Section 2 –Necessities of Life. 4 Necessities of Life. Water (Most chemical reactions for “metabolism” – all organisms activities, including getting energy from food, growing. etc – requires water. May get from food.)
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Organisms often have to compete for food, water, shelter or other necessities.
Carnivores (eat consumers; ex: lion)Omnivores (eat both; ex: brown bear)Detritivores (eat dead organisms; ex: vulture)Decomposers (detritivores that break down complex molecules in dead tissue/ wastes into simpler molecules; ex: mushrooms)