$X-$ Atmospheric input of phosphorus through rainfall is much smaller than carbon input.
$Y-$ The exchange of phosphorus between organisms and the environment is negligible.

Whale is

Choose the correct sentence.

Read the following statements carefully and answer the question:
$(1)$ Pyramids of number and biomass can be upright or inverted in an ecosystem.
$(2)$ Phosphorus and sulfur are sedimentary cycles.
$(3)$ The largest reservoir of carbon on Earth is found in the oceans.
$(4)$ The structural and functional unit of ecology is the ecosystem.
Which of the above statements are correct?

Sparrow eats seeds. Afterwards, it eats insects. In which trophic level does the sparrow belong in both situations, respectively?

Identify the given food chain:
Grass $\rightarrow$ Grasshopper $\rightarrow$ Birds $\rightarrow$ Lion