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HEREDITY
1. Like begets like i.e; every living organism reproduces its own kind. Frog reproduce frogs, rats reproduce rats only.
2. Heredity includes the characters which are transmitted from generation to generation and these characters are fixed for a particular organism.
VARIATIONS
1. No two individuals (except the identical twins) exhibit exactly similar characters. Differences are found even between the children of same parents. These are called variations.
2. The cause of genetic or hereditary variations in organisms is the sexual reproduction. All organisms would have
been of the same type if there was no sexual reproduction. Plants produced through vegetative reproduction are usually of the same type.
Evolutionary changes that occurred in humans are - Development of prominent chin. Increase in cranial capacity. Reduction of brow-ridges. Development of speech. Developme
This valve has the same basic features as of the Tricuspid Valve. It has an anterior and a posterior cusp. The anterior cusp is larger and is attached on the upper right part of t
what are the role of microbes in human welfare
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