Oxygen forms about 21% of the air around us. In your body, oxygen forms a vital role in the production of energy in most cells. But if gases can only efficiently diffuse across tiny distances, how does oxygen reach the cells deep inside your body? Enda Butler tracks the surprisingly complex journey of oxygen through your body.
So, variables.... There are lots of them when trying to test an idea. The trick is to isolate one variable at a time to get reliable results every time. But, how do we do that? In this episode of Crash Course Kids, Sabrina shows us how to isolate variables at the bowling alley!
Watch the INTERACTIVE video and practice your skills at identifying the independent and dependent variables of an experiment.Uploaded Dec 29, 2017
Water strider walking on water using surface tension of water. Phylum: Arthropoda, Class: Insecta, Order: Hemiptera, Family: Gerridae.Uploaded Sep 08, 2017