$A$ person who eats vegetables acts as a:

Zooplanktonic forms are

In hydrarch succession,the reed swamp stage is preceded by

From the above given features,how many are associated with primary succession?
Features:
$1$. Occur on newly cooled lava
$2$. Faster succession
$3$. Progress to mesic condition
$4$. Occurs on flooded land
$5$. Slower succession
$6$. Changes in flora only

Generally,the food chain has how many trophic levels?

Phosphorus of the ocean becomes available to land plants due to: