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Needs of Living Things What do you need? • Think for a moment. • W hatcould you notlive without? • Make alistin your notes. Now, What do you really need? • Look at yourlist. • Cross offthings that do not ensure (make sure of) your survival. What’s left? • Things that are necessary for you to continue to live. (despite popular belief, you will not die without your computer, cell phone or IPod) Here is what we, and all living things, need to survive. 1. Energy • Primary source: THE SUN! • The energy can be used in different ways • Energy use depends on whatthe organism is using the energy for For Example: ENERGY CARNIVO RE H E R BIVORE ENER A U T O T R O P HG Y ENER GY H E T E R O T R O P HS Definitions • Autotroph – organism that can make it’s own food • Heterotroph – an organism that cannot make it’s own food – Herbivore – consumes (eats) plants – Carnivore – consumes (eats) meat – O mnivore – consumes (eats) plants and meats 2. Food and water • FOO D – Energy source – Source of raw materials to grow, repair and develop • W A TER – Dissolves most chemicals,making then easier to move (transport) through the organism – Required for chemical reactions (i.e. photosynthesis, metabolism) 3. Oxygen • Certain organisms get oxygen from the environment • Oxygen is taken in and carbon dioxide is released • Plants use carbon dioxide in photosynthesis and release oxygen 4. Living Space • A limited number of organisms can occupy a particular area • The number of organisms depends on the amount of resources • Competition – the struggle among organisms to get enough food, water and energy 5. Proper temperature • Ho m eostasis – – W arm-blooded animals – able to keep their internal body temperature constant • i.e. – ma m m als, birds – Cold-blooded animals – must use their environment to control theirinternal body temperature within an acceptable range • i.e. – fish, reptiles, amphibians