What do organisms living in the inter-tidal zone (area of land between low and high tides) have in gommon?

they eat the same things

they are the same size

they have few predators

they can survive out of water

Fine out your self ponk

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.