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This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..
Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..
This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..
This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..