Question

what is food chain and what are the things required for continue it

Answer 1

A food chain is a linear sequence of links in a foodweb starting from species that are called producers in the web and ends at species that are called decomposers in the web. A food chain also shows how the organisms are related with each other by the food they eat.

Answer 2

A FOOD CHAIN CAN EASILY DEFINED AS A PLANT EATING ANIMALS EAT THE PLANTS AND ITSELF BE A PREY FOR ITS HIGHER LEVEL ANIMALS. FOR EXAMPLE :-
 GRASS - FROG - SNAKE ,
THESE THINGS REQUIRED FOR THIS DEPENDS UPON A FOOD CHAIN OR AS THE ANIMALS DESIRE