Why does my toilet have yellow water inside

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.