<span>Photochemical smog, created by the chemical reaction between sunlight, nitrogen oxides and volatile organic compounds is (e) generally worse during the winter months in part because of the increase in energy used to heat homes and other buildings.</span>
The kidneys filter the blood to remove wastes and produce urine. The ureters, urinary bladder, and urethra together form the urinary tract, which acts as a plumbing system to drain urine from the kidneys, store it, and then release it during urination.
Answer: By us people breathing in oxygen and breathing out carbon dioxide.
Answer:
reproduction is the process of producing offspring, whereas heredity is the process of passing on traits.
Because their are less humans who could harm them and less pollution and less predators.
