Why are there so many small creatures on the sand in the the shallows at the beach?

Question

Why are there creatures like sand crabs and bugs in the sand, and shellfish and urchins (shallows creatures) in the shallow water at the beach?

Answer 1

Because it's the PERFECT Place to live! The Sun warms the sand; the tides bring a regular supply of food... And if DANGER threatens- they can make a quick "get-away" into the Ocean! What's NOT to like? -WE should be so lucky!  :)

Answer 2

mehh,, wat he said ^^