1) which of these is an energy source for animals? a) food b) running c) habitats d) singing 2) plants are made up of ? a) dirt b) food c) plant cells d) hair 3) what is the largest organ of the human body? a) heart b) skin c) stomach d) brain 4) which one can eat both meat and plant matter just like humans? a) bears b) lions c) humming birds d) giraffes 5) which of the following is a gas? a) quartz b) oxygen c) sand d) metal

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