1) Interaction b/w living and non living things. a) ecosystem b) observation c) photosysnthesis d) respiration 2) process by which plants make their own food a) reproduction b) photosynthesis c) respiration d) digestion 3) the state of complete mental and physical well being  a) matter b) hygiene c) combustion d) health 4) matter has -------- states a) 5 b) 4 c) 3 d) 2 5) when two surfaces are rubbed against each other ------------- is produced a) friction b) force c) ash d) gravity

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