premise: when available resources decrease in an environment , organisms have to conserve those resources sent2: drought is when available water decreases in an environment sent3: a plant is a kind of organism sent4: if a crop requires less water then that crop will survive in a drought sent5: planting crops is a kind of activity sent6: a organisms require water for survival / to grow sent7: water is a kind of natural resource sent8: crops are a kind of edible plant for eating.
hypothesis: nails rusting is a kind of chemical reaction