What is meant by internal factors?
Internal factors: The disease-causing factor when it exists within the body of humans, is termed an internal or intrinsic factor.
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What is meant by the terms 'internal fertilisation' and 'external fertilisation' ? Explain with examples.
What is meant by external force and internal force?
What is meant by haemoglobin saturation? What are the factors it depends upon?
1) What is actually meant by total internal reflection ?Can this be explained by reflection of light by diamond?