Answer:
Like all mammals (including whales and dolphins) narwhals need oxygen. ... Fish use their gills to extract oxygen from the water. But narwhals, like us, use their lungs to breathe.
Explanation:
It depends on what illness and what country you are in but Mayo Clinic and Johns Hopkins are good sources.
Definitely the first: the water molecule is polar. :)
At a given moment in time, the instantaneous speed can be thought of as the magnitude of instantaneous velocity.
Instantaneous speed is the magnitude of the instantaneous velocity, the instantaneous velocity has direction but the instantaneous speed does not have any direction. Hence, the instantaneous speed has the same value as that of the magnitude of the instantaneous velocity. It doesn't have any direction.
Distance is 15 m + 11 m =26 m
Displacement is North 15 - 11 south= 4 m north.
