The number and kinds of organism is not constant. How do you explain this statement?
This question needs to be addressed from two perspectives, viz. number and variety. For any organism; the population cannot remain constant. In some of the generations, pollution can be more because of favourable condition. In some other generations, population can be less because of unfavourable conditions. The kinds of organism cannot be constant because evolution is a never ending process. In every era new species come
into origin and some old species become extinct.
