I have been participating in Teaching Blog Addict's Science Week this week. Today's Linky is for Science Freebies and Science Unit Sales. I didn't have anything to contribute, until Dawson was working on a plant cell microscope lab this morning.
One of the questions posed was: Why doesn't an animal cell have a cell wall, when a plant cell does?
Here is the technical answer from Wikipedia:
The cell wall structure provides a lot of support and stabilizes the overall structure of the plant. Cells can't move around. In animals, multiple interactions between cells and molecules around them (referred to as the extracellular matrix) help to hold everything in place but animals have no real equivalent to the, relatively rigid, cell wall.
This was a great visual for what he was studying. And it is your Science Freebie.