What is true about the isolated small tribal populations?

Options

(a) There is a decline in population as boys marry girls only from their own tribe
(b) Hereditary diseases like colour blindness do not spread in the isolated population
(c) Wrestlers who develop strong body muscles in their life time pass this character on to their progeny
(d) There is no change in population size as they have a large gene pool

Correct Answer:

There is a decline in population as boys marry girls only from their own tribe

Explanation:

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