Firmly press the suction cup down on a kitchen counter for 10 s. Grab the top handle of the suction cup and try removing the cup from the counter by pulling it straight up.

Conclude and Apply

Describe what happened when you tried to remove the cup from the counter.

Infer how echinoderms living in intertidal ecosystems withstand the constant pull of ocean waves and currents.

4; UV Watch

0 Real-World Question

How can you find out about the risks of ultraviolet radiation each day?

Possible Materials

• daily newspaper with weekly weather forecasts

O Procedure

1. Use the local newspaper or another resource to get the weather forecast for the day.

2. Check the UV (ultraviolet light) index for the day. If it provides an hourly UV index level, record the level for 1:00 p.m.

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