Video

This video would be a great one to use if you are going to introduce the food web and predator/prey relationships.  It has some great footage of animals chasing each other around.

Discusses how scientists go through the Scientific Method and Processes to experiment ideas, thoughts, notions and observations.   Great video.
 

This video explores why some people get allergies more often then others. What are allergies anyway? Did you know that people with good hygiene are more likely to form allergies or that having a pet as an infant might actually help you avoid getting allergies?

TEDEd created this video, which is an animation about how a cell is attacked by a virus.  It is very detailed and uses language that is easy to understand.  The video will go through many parts of the cell and demonstrates the processes of both the cell and the virus. 
 

Veritasium demonstrates a PyroBoard.  A PyroBoard is a flame that is bounced around by sound waves.  Through the experiment you can actually see and hear how the sound waves change.
 

Veritasium does a good job following the scientific method in order to find out what a candle flame is actually made out of.  Your students will get to see some experiments that will show the answer to the question.
 

This video was created and sung on the show Happy Days.  The tune is catchy and is sung about the process the heart goes through as it pumps blood.  Circulatory System.
 

Have you ever wondered what sound actually looks like?  In this NPR video, your students will actually get to see real sound waves as air is distorted.
 

This video also teaches kids what Schlieren Images are and how focussing light allows to see the unseen.

Experience a side-splitting video parody that imagines a calamitous weather forecast. Prepare to be entertained as students witness what happens when everything goes hilariously wrong. Suitable for students of all ages and adaptable to various settings, this video guarantees a memorable learning experience. After the laughter subsides, continue the educational journey by exploring the wealth of additional resources, including videos, worksheets, and labs, available at EducationalResource.org.

Have you ever wondered whether or not ketchup was considered a liquid or a solid.  After all it can take a lot to get ketchup out of a bottle.  Sometimes you have to shake and squeeze really hard and then it all come squirting out.  Well in this TEDEd video they will explore the science behind ketchup and other similar substances' viscosity.