Which two animals use echolocation?

bats and humans

bats and dolphins

dolphins and humans

dolphins and butterflies

The correct answer is -

bats and dolphins.

Echolocation (also termed as biological sonar) can be described as the ability of some animals to detect objects present in their environment by sensing echoes and sound waves of those objects.

Dolphin use echolocation to see various organisms/objects better underwater.

Bats loctate their food during dark by sending sound waves, which hit a food source/an object and bounces back, producing echo that is ultimately sensed by bats.

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one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.