The reason an ambulance sien sounds higher in pitch as it approaches you is because the ambulance pushes the sound waves together. This results in the sound wavelengths in front of the ambulance getting shorter Which of the following statements is true?

What is the first step in a life cycle of a plant reproduce sexually

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.