B7 OCR Symbiosis revision 21st century science

Mutualism

• this is where both things gain from being in the  relationship 
• for example clown fish and sea anemones, the sea anemone is prtactedd bythe fish as is cleaned by it and the clown fish gets a home and protection it is able to live in them because they have slimy covering 

Commensalism

• this is where one thing gains and the other neither greatly  gains or loses out 
• an example is the shark and the remora fish which cleans it 

Parasitism 

• harms one  thing and the other gains 
• for example a tape worm and a human 

 they can kill people though the most clever or evolved ones don't kill though they can also effects crops such was the case in ireland when there wwas a potato famine and they cause diseases so they have social and economic impacts

they tend to be very evolved inline with that of there host for example a tape worm

• is flat and long to fit in the intestines
• has an enyzme resistant coating so it doesn't  get digested
• has hook like teeth and suckers to grip to the wall of the intesines with 
• big surface area to absorb lots of food with