Sex chromosomes are the primary deciders of the sex in all animals.

True

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False

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Solution

The correct option is B
False

In several lower animals, sex can be decided based on the number of chromosomes. While haploid organisms become males, diploid organisms become females. In some organisms, sex is decided on the basis of hormonal levels and the organism can switch between male and female sex in a single lifetime. Metabolic rates and even environmental factors such as temperature, play a role in sex determination in some animals.

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