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agriculture
<em>-</em><em> </em><em>BRAINLIEST</em><em> answerer</em>
If the Beluga Whale makes a sound that hits a fish moving towards it, the frequency of the sound that the Beluga gets back will be increased (higher pitch). If the fish was moving away when the sound hit it, the sound will come back to the whale in a lower frequency (lower pitch). So depending on what sound the whale hears reflected off the fish, it can tell if the fish is moving away or closer.
A ring with a radius of 10 yards . . .
-- has a diameter of 2·r = 20 yards,
-- has a circumference of 2·π·r = approx. 62.83 yards
-- has an area of π·r² = approx. 314.2 square yards.
-- The total amount of grass that grows inside the ring depends on
the length of the growing season in that location, and also on the
length of time that horses occupy the ring.