For ecosystems to function they need energy; and we can see how this energy moves through ecosystems with food chains. We also explore how the populations of predators and prey vary over time with predator prey cycles.

What can you do if you get an unexpected question on IELTS Speaking Part 3? You need strategies to avoid hesitation and show your fluency! Today you'll learn 3 filler phrases that are perfect for questions that are out of the left field.

This video explores five fun facts about biggest cities.

Howcast - Learn how to say "no" in Russian with this online Russian language lesson from Howcast.

This video discusses run-on and fragment sentences and the ways to correct them.

This video explores five fun facts about bridges.

Howcast - Learn how to forgive someone who has cheated on you from couples counselor Victoria Wilson, Ph.D. in this Howcast video.

A complete sentence has a capital letter, a subject and a verb, punctuation, and is a complete thought. Fragments and run-on sentences are two sentences that are not complete.

Everyone deserves to recognize themselves in the books they read. See why YA authors think diverse books are so important with these quotes! What do you want to see more of in books? Tell us in the comments below! Subscribe to Epic