Silver Burdett/

Science: Understanding Your Environment/

Your Living Environment p. 9/

1975/

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S4N1/

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/-/Your environment includes*D1 everything (around you. )/-/It includes*D1 living=P--01 and nonliving things. /-/Your living=P--01 environment includes*D2 plants and animals. /-/Some (of them )are*A1 important (for your survival. )/-/Others are*A1 not. /-/How long do you think*D1 [DOyou could stay*A1 alive [ARif there were*N2 no plants or animals (in your environment? )]]/F/A day?*E0=U--02 /F/A week?*E0=U--02 /F/A month?*E0=U--02 /-/No one really knows*D1 how long. /-/(Without plants and animals, )you would soon die.*- /-/Man depends*- (on living=P--01 things )(for more )(than food. )/-/(For many centuries, )man lived*- (by hunting=GOP072 )plants and animals (in the wilds. )/-/He cut*D1 trees to build=IAV031 homes. /-/He burned*D1 wood to keep=IAV031 warm. /-/He raised*D1 sheep and grew*D1 cotton to get=IAV051 materials (for cloth. )/-/He tanned*D1 animal hides to make=IAV052 shoes and clothing. /-/He learned*D1I to make=IDO081 medecines (from certain plants and animals. )/-/(In more recent times, )man has dug*- (into the earth )(for fuels. )/c/But even (with these fuels, )he is still depending*- (on plants and animals. )/-/He uses*D3 coal and oil and gas (as fuels. )/-/These fuels were formed*P millions=U--03 (of years )ago (from plant and animal bodies. )/-/No matter=SAV051 [PNwhere man turns,*- ]his life depends*- (on plants and animals. )/-/He uses*D2 both living=P--01 and dead=P--02 plants and animals. /-/Suppose*D1 [DOyou had lived*- (about 10,000 )years ago. ]/-/Do you think*D1 [DOyou would have seen*D1 the same kinds (of plants and animals )[JRyou see*D0 now? ]]/-/Probably you would have seen most*D1 (of them. )/c/But you would have seen*D2 some plants and animals [JRyou do not see*D0 today. ]/-/They have disappeared*- (from the earth. )!!!!!!!!