7. Write two importance of class pisces.​

As food

For controlling diseases

For scientific value

Any two importance of class Pisces are :

i) Fish can be eaten as food and it is an excellent source of protein, has very little fat,etc.

ii) The fish waste after the extraction of oil, is used as fertilizers.(fish manure)

compost can be added to topsoil as a:

pesticide

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.