How do fishes and aquatic animals survive in winters when the pond gets covered with thick ice?

Why do aquatic animals die in boiled water ?

How the fishes can survive in the extreme winter, when ponds and lakes are frozen?

Which animal would not survive, if there were no ponds of water?

Why do animals curl into ball during winter ?

How is the life of organisms living in water affected when water gets polluted ?

Give appropriate biological or technical terms for the following: Aquatic animals having star-shaped body covered with spines

Consider the following four statements (i)-(iv) about certain desert animals such as kangaroo rat. i) They have dark colour and high rate of reproduction and excrete solid urine ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs iii) They feed on dry seeds and do not required drinking water iv)They excrete very concentrated urine and do not use water to regulate body temperature. Out of these four, which two are correct :

Fishery is an industry devoted to the catching, processing or selling of fish, shellfish or other aquatic animals. Some of the very common freshwater fishes include

Give reasons : Aquatic animals and plants are able to survive in water.

Why do the machine parts get jammed in winter?