In a pond ecosystem,zooplankton can be placed at which trophic level?

Identify the odd one out.

If a $succession$ occurs in a $hydric$ (aquatic) area,the final climax community will be .....

$A$ plant being eaten by a herbivore,which in turn is eaten by a carnivore,constitutes a:

Phytoplankton $\rightarrow$ Submerged plant stage $\rightarrow$ Floating plant stage $\rightarrow$ Reed-swamp stage $\rightarrow$ Marsh-meadow stage $\rightarrow$ Scrub $\rightarrow$ Forest. What type of succession does this sequence represent?

What is a biogeochemical cycle? What is the role of the reservoir in a biogeochemical cycle? Give an example of a sedimentary cycle with a reservoir located in the Earth's crust.