The correct answer is "gills that can draw oxygen out of the water".
Explanation:
The intertidal zone is a complicated are for organisms as they need to adapt to live above water level at low tide and underwater at high tide. Sand dollars are a type of sea urchins that have adapted to live at intertidal zones, however they cannot live to long out of the water. Sand dollars have gills that can draw oxygen out of the water, they bury itself in the sand and move to try to go back to water.
If the mass of an object increases, then its kinetic energy will increase proportionally because mass and kinetic energy have a linear relationship when graphed.
