Humans need sun on our skin to trigger the production of vitamin D, which is necessary for building bones and teeth.
Human digestion
Human digestion Many of the drugs that humans take survive the
digestive system and are passing through sewage works into rivers
and seas. Scientists believe that these drug pollutants are
responsible for the deaths of many tiny aquatic organisms. Some of
the drugs have also been found to alter spawning patterns in
different types of marine species. 10 MAY 2000
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