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Giraffe and okapi.
What is Angina pectoris?
What is embolus? vascular disease.
Venous system of the human body.
What is arterial system of the human body?
What are veins?
What are types of blood cells?
Circulatory system of man. biology
How food is transported in plants? biology
what is pressure flow mechanism in botany?
What is cohesion tension theory of transpiration? BIOLOGY . PLANT physiology
How stomata open and close?
