Name three conservationlaws from nature.

Name three metals.which occur in nature miainly as oxide ores. Name one-oxide ore of each-of them.

Name the three germ layers?

Name the major constituent in natural gas….

Name three kinds of excretory organs found in invertebrates ?

Take any three consecutive natural numbers and add the first and last .Is there any relation between this sum and the middle number?

Name the three isotopes of hydrogen.

Rubber is a natural polymer obtained from the bark of rubber trees Name the monomer of natural rubber

Sum,of the squares of three consecutive natural numbers is 110.

Name three classes of phylum coelenterata?