The graph below shows the changes in two populations of herbivores in a grassy field. A possible reason for these changes is that
all of the plant populations in this habitat decreased
population $B$ competed more successfully for food than population $A$ did
population $A$ produced more offspring than population $B$ did.
population $A$ consumed the members of population $B$.
Maximum productivity is found in
Intermediate community between pioneer and climax communities is called
Which of the following is the major source of phosphorus
Both hydrarch and xerarch successions lead to
Most stable ecosystem is