The most abundant element in earths continental crust byway is blank

The teacher is mostly talking about the distillation of a mixture

60.0 - there are 3 significant numbers

We can't until we know what we are working with or on

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.