Science

• Absorption

  Chemical passes through a membrane like skin or alge
• Ingestion 


  Chemical is actively taken in by organism
• Herbicides 


  Chemical designed to kill plants
• Insecticides 


  Chemical designed to kill insects
• Fungicides 


  Chemical designed to kill fungi
• Persistent Pollutant


  Pollutant that do not break down easily
• Bioaccumulation


  Contaminant in organism’s body increases as the organism gets bigger
• Nitrogen Fixation


  Bacteria in soil and root of legumes plants covert nitrogen gas into ammonium ions
• Nitrification


  The process of turning ammonium ions into nitrites and nitrates
• Assimilation 


  Plants absorb nitrates
• Ammonification


  Turn nitrogen compounds from dead organisims and organic waste into ammonium
• Denitrification


  The Process of turning nitrates into nitrogen gas
• Human activities that affect Environment Chemicals


  Burning Fossil Fuel

  Plastic
• Non-persistent 


  Will naturally breaks down
• Persistent 


  Will not naturally break down
• Pesticides


  Chemical substance which destroy or make instects go away
• Pollution


  Harmful substance to the environment
• What was DDT originally used for? 


  Used to fight mosquitoes that carry malaria
• DDT in environment 


  Takes 12 years to be gone

  Can be eaisly stored in a tissue of organism
• DDT Side effect


  Cancer
• Biomagnification


  Big organism need more food, meaning, they consume more toxic