The basis of life is

The total solar energy converted to biomass on Earth amounts to approximately: (in $\%$)

Plants differ from animals in having

Chitin is a structural polysaccharide and is a polymerised form of:

Choose the correct option.
$x$ - More than $70$ percent of all the species recorded are animals.
$y$ - The number of algae species in the world is more than the combined total of the species of fishes,amphibians,reptiles,and mammals.
$z$ - India is one of the $15$ mega diversity countries of the world.

$A$ water molecule shows: