Why conserve water? Because fresh water is rare and the process to clean water is expensive; therefore it shouldn’t be wasted. The next time you are tempted to waste water, think of all poor people who can’t afford clean water. Many children die and suffer everyday from dehydration and water that are unclean. :(
Cells,tissue,organ organism,organ system
There is no defined limit on the capacity of the brain. The brain's capacity cannot be measured as it is not subject to a defined "space" where the memory is kept, and it is not such that each neuron is responsible for a single memory. The brain has complex mechanisms of memory storage, that even improve if trained.
C. because stimuli is how your body responds to something, and in this case, someone's heart rate increases WHEN their blood oxygen drop. Do you see how it responds? ;-)
