Dogs have formed such a strong bond as pets, workers and companions to humans that they have earned the nickname "man's best friend".

A frog is an amphibian. They lay their eggs in water. The eggs hatch into a tadpole which lives in water until it metamorphoses into an adult frog.

Many cancer patients that are treated with chemotherapy lose their hair. For some when the hair grows back, it can grow back a different colour, or be curly or straight.

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