Sea Urchins "See" with Spikes

Sea urchins don't technically have eyes, but they can "see," according to Sonke Johnsen of Duke University:

The spiky body of a sea urchin acts as one big, spine-covered eye, confirms a new study that tested how well urchins can see.

Sea urchins, like their close relatives the sea stars (starfish), don't technically have eyes. Instead, the ball-like invertebrates detect light striking their spines and compare the beams intensities to get a sense of their surroundings.

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"compare the beams intensities" should be "compare the beams' intensities".

There are more than one beam and they have intensities. Apostrophe goes after the s.
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