organisms are biotic factors of an environment & natural resources can be abiotic factors of an environment ->  resources are generally abiotic factors of an environment and organisms are biotic features of an environment  resources are generally abiotic factors of an environment and organisms are biotic features of an environment & changes to abiotic factors in an environment affect biotic factors in that environment ->  changes to resources in an environment affect organsims in that environment  changes to resources in an environment affect organsims in that environment & a decrease is a kind of change ->  a decrease in resources in an environment affects organisms in that environment  a decrease in resources in an environment affects organisms in that environment & organisms compete for resources in an environment ->  as a resource required by an organism decreases , the competition among organisms that require that resource will increase  as a resource required by an organism decreases , the competition among organisms that require that resource will increase & a living thing is an organism ->  as a resource required by a living thing decreases, the competition among living things that require that resource will increase  changes to abiotic factors in an environment affect biotic factors in that environment0 & living things require water for survival ->  water is a kind of resource that is required by living things  as a resource required by a living thing decreases, the competition among living things that require that resource will increase & water is a kind of resource that is required by living things ->  as water in an evironment decreases, the competition among living things increases  as water in an evironment decreases, the competition among living things increases & a consumer is a kind of living thing ->  as water in an evironment decreases, the competition among consumers increases  as water in an evironment decreases, the competition among consumers increases & drought is when available water decreases in an environment -> a drought causes competition among consumers to increase