(Q).
Adult echinoderms have radial symmetry, and modern echinoderms include starfish and sea urchins. Given these facts, what has radial symmetry among the following options: - sea urchins - A Greek letter - humans - Most plants - peachleaf willow - catfish - gastropod shells - ducks
(A).
sea urchins

(Q).
Killing microorganisms in food can be used to extend the shelf life of that food, and sterilization kills all viable microorganisms. Given these facts, what can be used to extend the shelf life of that food among the following options: - sterilization - Enzymes - poison - chemical changes - hybridization - gasoline - rays or beams - Cooking
(A).
sterilization

(Q).
Mollusks are invertebrates such as the common snail, and mollusks in the diorama include snails and clams. Given these facts, what are clams among the following options: - lobster - dangerous - birds - crabs - a fish - mollusks - fertile - Catch prey
(A).
mollusks