Metals are used to make cooking utensils . why ?​

Metals are good conductors of heat as well as electricity.Cooking utensils require heat.So Metals are used in fry pans ,Ovens etc

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

The answer is the third choice