Snakes are included under which category in a food chain?

Observe the given chart and identify what it represents.

Omnivores feed on members of which trophic levels?

Read the given statements and determine how many of them are correct.
$(1)$ Secondary succession depends on the condition of the soil and the availability of water.
$(2)$ Air,water,and land are abiotic factors of an ecosystem.
$(3)$ The structure of an ecosystem includes the cycling of nutrients and the unidirectional flow of energy.
$(4)$ The primary source of energy in an ecosystem is the sun.

The first plants to reappear in a badly burned forest area will most probably be

Which of the following are known as the 'pioneer species' in primary succession?