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Biology: Excretion

Genetics & Biotechnology

Lungs (cellular respiration)

How the Lungs Work
National Heart, Lung, and Blood Institute
Lungs and Respiratory System
TeensHealth
The Respiratory System Review
Khan Academy

Body Temperature

How the Body Regulates Heat
Rush U Medical Center
Physiology, Temperature Regulation
NCBI
Your Skin
KidsHealth

Water

Fifteen Benefits of Drinking Water
Medical News Today
The Water in You: Water and the Human Body
USGS
Why Drinking Water Is the Way to Go
KidsHealth

Exercise

Exercise & Fitness
TeensHealth
WHO Guidelines on Physical Activity and Sedentary Behaviour: At a Glance
WHO

Liver (assimilation of amino acids, deamination of amino acids)

Liver: Structure Diagram Purpose Regeneration Diseases Symptoms Prevention
Healthline
You May Never Stop to Think About it, But Your Liver is Essential to Your Life
Canadian Liver Foundation
Your Liver
KidsHealth

Urine

The Digestive and Excretory Systems Review
Khan Academy
The Urinary Tract & How It Works
The National Institute of Diabetes and Digestive and Kidney Diseases