Consider the heating curve for water. Temperature (°C)
Heating Curve for Water
160
140
120
100
80
60
40
20
0
-20
1 2 3 4 5 6 7 8 9 10
Time (min)
At what temperature does the solid start melting?
O-20°C .

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Answercanyon;

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.