A is flat land that is higher than the land around it. A. plateau
B. plain
C. valley
D. canyon

The correct answer would be b) volume versus temperature, because they are also directly proportional.

Answer two atoms of oxygen;

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.