Rocky Shores

2. – the point when seawater retreats to its lowest level during a tide cycle
3. – organisms that eat other organisms
5. – small tubes on the mouth-side of a sea star that it uses to move and to grasp surfaces or prey
9. – the region of land that is covered and uncovered by water between high and low tide
11. – organisms that break down organic waste and feed on the nutrients
14. – a community of different species that depend on interacting with each other and their physical environment for survival
15. – the alternating rise and fall of the sea with respect to land

1. – anything that can cause harm to an ecosystem (e.g., pollution, deforestation, invasive species, overhunting, climate change)
4. – marine animals with organs that gather energy by straining nutrients and small organisms out of the water (e.g., mussels, barnacles, sponges)
6. – the study of living things in their natural environment; includes where organisms are found in an ecosystem, the relationships between organisms, and the interactions between energy and life
7. a series of water-filled canals that function in sea star locomotion and feeding
8. – the point when seawater rises to its highest level during a tide cycle
10. – drying due to the removal of water
12. – any factor that reduces the ability of an organism to survive
13. a visual that shows the network of food chains in an ecosystem