Answer:
Explanation:
Ecological succession is a process of inhabiting a zoological area by a group of organisms. it involves many stages to reach the climax stage such as primary, secondary, tertiary names basing on the habitat where it occurs. once the organisms reach the most stable stage of the succession. thus it maintains equilibrium Succession helps restore the equilibrium of an ecosystem by forming up new species, diversifying species, and basically by replacing the damaged, deranged, or disturbed community. For instance, when a sudden climate change occurred in a community, such as drought, dryness, fire, or heat waves, all living things that depends on water or survives in a cool, wet environment will die or migrate somewhere else. Thus, leaving that community vacant and/or unoccupied by any living things. Succession, then, will take place in that area by going through various stages until reaching the climax stage, in which the ecosystem is complete again.
For finding a momentum p=mv so p=9×2 , P=18
The average fluid velocity in the pipe can be obtained by dividing the flow rate of the liquid by the cross-sectional area of the pipe.
Av velocity = Flow rate/Cross-sectional area
Given, flow rate of the liquid = 0.008 m³/s
Cross-sectional area = 
, radius of the pipe is 0.02 m.
Substituting the values we get,
Av velocity= 
= 6.36 m/s
Average velocity of the fluid is 6.36 m/s.
