এক বছর ও পানির শতকরা পরিমাণ কত

Explanation

Greatest amount of energy is lost while

Explanation

Pupa swims in water through

Explanation

Each stage in food chain is called a/an

Explanation

Trophic level refers to the

Explanation

Balance between producers and consumers forms the

Explanation

Damage, diseases and death may be caused by the

Explanation

Malarial preventive drugs include

Explanation

Chemical energy trapped in dead bodies is released through the

Explanation

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

Explanation