In primary succession in water,the pioneer species are

The possible beneficial effect of grazing animals is the

The movement of nutrients from non-living components to living components and back to non-living components in a cyclic manner is known as:

The green plants in an ecosystem which can trap solar energy to convert it into chemical bond energy are called

Which of the following ecosystems would be most stable?

Which of the following trophic levels are occupied by a sparrow?