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Answer 1

Variation:-

• In case of sexual reproduction, two parents or two individuals of different sexes are needed for the production of offspring.

• The nucleus contains the DNA which carries the heredity characters from one generation to other.
• It contains all the information to make specific proteins which performs the metabolic activities.
• The DNA form it's copies to be transported from one to another.
• The formation of new DNA from older ones is called replication of DNA.

• The DNA copies are similar to the older ones, but not identical unlike the asexual reproduction. Some minor alterations occurs which leads to variation. This allows the organisms to survive with the changes in environment$.$

Example:-

• One of the best example is the colour of the wing of Moths due to several variations corresponding the nature.

• Moths were previously bright coloured but this led to their decrease in number.
• How? Their bright colours are easily spotted by the predators and hence they were killed.
• Moths with wings similar to the color of tree bark are better able to camouflage themselves than moths of a different color. Hence, They could survive.

Answer 2

Step-by-step explanation:

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