According to Robert Constanza average price tag for ecosystem services is

Pond is defined as a

What is a biogeochemical cycle. What is the role of the reservoir in a biogeochemical cycle. Give an example of a sedimentary cycle with reservoir located in earth’s crust.

In the vast marine ecosystem, certain sea develop red colouration. This red colour is due to the presence of large population of which one of the following organisms?

Choose the correct identification for the given stage of succession and is procceded by which stage respectively?