Give any two striking similarities in the sequence fo embryonic development of all vertebrates.

Give any two uses of gypsum?

Give any two examples of ferns.

Give any two microbes that are useful in biotechnogy.

There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-chambered heart.

Give any two examples of xerarch succession.

Give any two examples of leaf tendrils.

Give any two ways in which biodgradable substance would affect the enviroment?