Which one of the following is an example of a glycoprotein?

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

The type of linkage present in carbohydrates is

In the organisms which show bioluminescence,the chemical energy of the cell is converted into

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.

There is an exchange of materials and energy between living organisms and their surroundings. Such a system is called: