Which of the following exhibits scavenging?

Identify the likely organisms $(1), (2), (3)$ and $(4)$ in the food web shown below.

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

Find an incorrect statement for $DFC$ (Detritus Food Chain).

In the dry weight of living beings,$A$ $\%$ carbon is present. In the oceans,$B$ $\%$ of the total global carbon is dissolved. The total amount of carbon in the atmosphere is $C$ $\%$ of the total global carbon. Identify the correct values for $A, B,$ and $C$.

If carbon dioxide is withdrawn from the biosphere,which organism would first experience negative effects?