B, C, D, B
I hope these are right, hope this helped.
Habitat destruction is the cause of the loss of species because the organism have been deprived of their living requirements.
Biological Control is the answer Definition: Is the use of natural enemies-predators, parasites, pathogens, and competitors— to control pests and their damage
The water level in the bucket would drop.
This is because the pebbles have a greater density than water - they displace more water (when floating in a cup), than their volume. Thus the water displaced by the cup of floating pebbles has to be more than the volume of pebbles in the cup.
