Nectar is a sweet liquid that some flowering plants produce. A hummingbird drinks nectar from a flower. When a hummingbird drinks nectar, pollen from the flower sticks to the hummingbird's beak. The picture shows a hummingbird drinking nectar from a flower. Which statement explains the role of a hummingbird in the life cycle of a flowering plant? OPTIONS:
- A hummingbird carries food to the plant.
- A hummingbird helps the plant reproduce.
- A hummingbird protects the plant from predators.
- A hummingbird makes the flowers produce nectar.
A: A hummingbird helps the plant reproduce.

An ice cube placed in sunlight melts quickly. Which BEST explains this event? OPTIONS:
- The Sun is far away.
- The Sun makes heat.
- The ice cube is a solid.
- The ice cube looks clear.
A: The Sun makes heat.

Which list gives the correct order of substances from the lowest melting point to the highest? OPTIONS:
- oxygen, water, iron
- water, iron, oxygen
- oxygen, iron, water
- iron, oxygen, water
A: oxygen, water, iron

Which is the correct order of the metamorphosis of a butterfly? OPTIONS:
- egg, larva, pupa, adult
- egg, pupa, larva, adult
- egg, adult, larva, pupa
- egg, larva, adult, pupa
A:
egg, larva, pupa, adult