Scientists digging in a cave found an unknown substance. The scientists found that the substance’s molecules were moving around each other. The scientists increased the speed of the substance’s molecules and caused a phase change. How did the scientists do this, and how did this affect the substance?

The scientists transferred energy . . .

a

into the substance, and the substance changed into a gas.

b

into the substance, and the substance changed into a liquid.

c

out of the substance, and the substance changed into a solid.

d

out of the substance, and the substance changed into a liquid.

a . into the substance, and the substance changed into a gas.

Explanation:

The correct answer would be that the scientists transferred energy into the substance, and the substance changed into gas.

Since the molecules of the substance are already in motion before the addition of energy, it means the substance is in liquid form as opposed to solid. Further addition of energy will result in the molecules of liquid moving faster and change phase into a gas.

The molecules of solids are stationary initially, addition of energy will result into liquid and not directly into gas, unless the substance has the capacity to sublime.

Hence, the correct option is a.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.