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The inability to differentiate certain shades of colour is called colour vision deficiency.
Glands of the endocrine system secrete hormones into the blood.
The longest part of the digestive system, where most of the digestion and absorption...
In this lesson you will learn more about this special liquid.
The withdrawal reflex is a spinal reflex that ensures moving away from potentially...
This animation demonstrates the internal structure of the brain.
Smoking severely damages the respiratory system, it may cause COPD or lung cancer.
Learn more about the early stages of human development with this lesson.