The maximum biomagnification would be in which of the following in case of an aquatic ecosystem?

Discuss the role of women and communities in the protection and conservation of forests.

If an agricultural field is liberally irrigated for a prolonged period of time,it is likely to face the problem of:

Choose the correct option regarding the following statements:
$(1)$ $CO_2$ contribution in global warming is $60\%$.
$(2)$ Greenhouse effect occurs due to deforestation.
$(3)$ Due to the greenhouse effect,the present average temperature at the surface of the Earth is $15^oC$.
$(4)$ The amount of $DDT$ in small fish is $0.05\ ppm$.

Lead $(Pb)$ causes:

What is the effect of an algal bloom in a lake?