Which statements describe properties of stars? check all that apply
stars produce energy through nuclear fusion.
stars produce energy through gravity.
stars are massive objects composed of gas.
stars are solid objects that we could stand on.
stars are composed primarily of hydrogen and helium.
stars are composed primarily of liquids such as water.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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