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24/7 Science
Interactive Part 1: Identify the Independent and Dependent Variables with the Myth Busters 

Crash Course Kids

Living Things Change

Amoeba Sisters
DNA, Chromosomes, Genes and Traits
Punnett Squares and Sex Linked Traits
Classification
Dichotomous Keys
Natural Selection
Mitosis
Prokaryotic vs. Eukaryotic Cells
Introduction to Cells: The Grand Tour
Cellular Respiration and the Mighty Mitochondria
Photosynthesis and the Teeny Tiny Pigment Pancakes

SciShow
What Makes a Species a Species
10 Ridiculous Scientific Names
3 Amazing Photosynthetic Animals
3 Coolest Things Built by Bugs
Immortal Cells Turn 96