Ready to learn about ecosystems? This is the way we are going to start the lesson: 
 
To have an introduction on the topic, view in Blinklearnig the  ANIMATION  in  Plus Zone. Then view the PRESENTATION .

https://www.blinklearning.com/coursePlayer/clases2.php?editar=0&idcurso=1634990&idclase=95804600&contentStyle=oxford-tdl-2&modo=0#pluszone_4

In FICHEROS ADICIONALES, right below, you´ll find some other resources that may help you to do worksheet 3.1, which corresponds to contents on pages 46 and 47 of your natural sicence book.