species and variation

• define the term species.


  A species is a group of organisms that can interbreed and produce fertile offspring.
• What is variation?


  differences between organisms
• two types of factors that affect variation


  genetic factor

  environmental factor
• state examples of genetic factors


  eye colour, hair colour nose shape, blood group, biological sex
• state examples of environmental factors


  piercings, injuries: lead to scar formation, change hair colour, exposure to the sun: change skin colour