8. describe a cell which effectively uses diffusion as a means to move materials in and out.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.