1. Fig Wasps

2. Lichens as Bio-indicators Lichens are alga and fungi living symbiotically (they have to live together to survive) The alga make sugars by photosynthesis and gives some to the fungus The fungus delivers water and minerals to the alga

3. Check your answers These are called Crusty These are called Flakey These are called Leafy These are called Shrubby

4. Indicator species – Invertebrate as indicator of water pollution Rat tailed maggot Live in sewage polluted water Flatworm Live in slightly polluted water Fresh water shrimp Live only in fresh water You can determine if the water is polluted by collecting a sample of suspected water and analysis the type of animals that are in the sample.