How humans reduce the biodiversity

• What is biodiversity? 

  The variety of living things on earth, or within a particular ecosystem
• Give three reasons why maintaining high biodiversity is important.

  • increase the stability of ecosystem
  • many species provide specific services like pollination
  • many of medicinal drugs come from specific species
• Select two impacts of rapid growth in the human population.

  • more resources are being used
  • more waste produced
• Which two of the following substances contribute most to water pollution?

  • sewage from cities
  • fertiliser from agriculture
• Which two of the following substances contribute most to air pollution?

  • smoke from combustion
  • acidic gases from burning fossil fuels
• Which two of the following substances contribute most to land pollution?

  • landfill
  • nuclear waste