Answer:
[tex]3000[/tex]
Explanation:
Given
Population Density of marine species population [tex]= 3[/tex] cubic meter of water
Total volume of water [tex]= 1000[/tex] cubic meters
The number of species in a given habitat
[tex]= p_d * S[/tex]
Where [tex]p_d[/tex] is the density of population per unit area or volume
S is the size of habitat for a given population. It can be area , volume or any other unit of measurement.
Substituting the given values in above equation, we get -
[tex]3*1000\\= 3000[/tex]
