A group of campers travels to a cabin which has no electrical power. In order to provide power for a heater and lights, which device would be appropriate?

Particle exchange energy though elastic collision , hope this .

Bthats what im doing to and i figured it out it is b

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.