Get to the bottom of what's at the bottom of the sea. When children accompany Mr. Baker's science class to the aquarium, they'll meet and find out all about a variety of fascinating underwater life. A simple pull of the tab reveals the skeletons of such ocean creatures as the spiny, stinging lionfish; the giant 8-foot-long, 1,500-pound sea turt= and the manta ray, which looks like a huge blanket gliding through the water. There's even an amazing killer...