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.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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