Answer:
Diffusion is an example of passive transport and it requires no energy.
Explanation:
Answer:
this is point source becuse its cause by human inertaction
Explanation:
Answer:6 km/h
Explanation:
Given
Velocity of Sailboat is 
Velocity of ocean current is 
negative sign indicated it is opposite of Sailboat
Therefore, velocity of sailboat w.r.t ocean current is



The answer might be 3 bases,a codon