The lives of aquatic animals depend on water.
(a) Explain the pH change as the cause of tooth decay. How can we prevent tooth decay caused by pH variations?
(b) Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
Question 18
Fill in the blanks:
(a) Saline water, hot air and sand are ........components of a habitat.
(b) The habitat of plants and animals that live in ........ is called the aquatic habitat.
(c) ........enable a plant or an animal to live in its surroundings.
(d) Plants and animals that live on land are said to live in ........habitats.