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Roots grow very deep and reach the layers where water is available. Which type of plants develops the above adaptation? Why?
 
a.  are the plants that develops roots which grow deep to reach the layers where water is available.
 
b. The plants are adapted to survive under .
 
c. As these plants  they have roots which grow deep to reach the layers where water is available.
 
d. The plants have  that enable the root to absorb a sufficient quantity of water.