Why more viscous oil is used in summer than in winter in scooters?

How will you account for the observation that automobile tyres is inflated with lesser air in summer than in winter?

Why cotton dress is preferred in summer?

Why are tyres of automobiles infliated to lesser pressure, in summer than in winter?

Why is sand drier than clay?

In summer we use air conditioners and in winter we use heaters. Here homeostasis is accomplished by artificial means. Explain four ways by which other living organisms cope with the situation.

Why oil is poured to calm the sea?

Why are potassium and caesium, rather than lithium used in photoelectric cells?