Pls help According to the Doppler Effect, why does a siren sound higher pitched as a vehicle drives toward a person, then lower pitched as the vehicle drives away? Question 38 options: The person's hearing cannot keep up with the moving vehicle. The vehicle had engine problems that made the sound change with distance. The sound waves are compressed as the vehicle drives toward the person and decompressed as the vehicle drives away. The sound waves are stronger as the vehicle drives toward the person and weaker as it drives away.

i would think a oil tanker that has leaked in a bay

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.