1. What is tidal range?
It is the difference in water level between succesive high and low tides.

2. What causes high and low tides?
It caused by the gravitational pull of the moon and sun, and by the rotaions of the earth, moon, and sun.

3. What causes spring and neap tides?
Spring tides are caused when the sun and the moon are in line with each other. Neap tides occur when the moon is in a quarter.

4. How does tidal range effect the types of organism and the shape and size of the organisms?
Marine organisms can only live where there is water. As the tide becomes low, some organisms shrink in size and become dry. Then when the tide becomes high, some organisms are able to replenish themselves while others that can't live without water dies out.