Which procedure is the surgical fixation of an undescended testicle?

If you relate the doppler effect on sound to the color of light waves, a police car would be the color as it approaches and the color as it recedes away from the observer.

Internal feedback works to maintain homeostasis when your a. heart rate decreases as your white blood cells increase b. breathing rate decreases as your red blood cells decrease c. heart rate increases as your liver is cleaning blood d. breathing rate increases as your heart rate increases

Excess nitrogen can lead to a algal blooms and the death of fish. which characteristic of nitrogen causes this problem?