এক বছর ও পানির শতকরা পরিমাণ কত

Greatest amount of energy is lost while

Pupa swims in water through

Each stage in food chain is called a/an

Trophic level refers to the

Balance between producers and consumers forms the

Damage, diseases and death may be caused by the

Malarial preventive drugs include

Chemical energy trapped in dead bodies is released through the

If plants absorb carbon dioxide (CO2) in water (H2O), water becomes