Dolphins use echolocation to them navigate. they emit a sound that bounces off objects in front of them. dolphins are able to navigate their surroundings based on how long it takes the sound to return. what property of waves are dolphins using to them find their way around their environment? absorption diffraction reflection refraction

REFLECTION

Explanation:

Reflection of the sound wave is its property to bounce back after striking a surface.

Since dolphins use echolocation where the emitted sound is bouncing back after striking the object which helps it to navigate the property of the sound wave is the reflection.

The reflection of the sound waves is responsible for producing echoes as an echo occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.

she wanted to find out what bacteria would grow faster I think the answer is A..

Explanation:

the scientist add more bacteria to gel A.