Gravity tends to pull Earth and the moon toward each other, but inertia, sometimes called _____, keeps them apart.  

Water from waves washing onto a beach, called the _____, carries particles onshore and increases the beach’s slope. 

Marine erosion is usually most rapid on _____ coasts. 

One of the first persons to classify groups of organisms into natural categories was the 18th-century naturalist _____. 

Any aspect of the physical environment that affects living organisms is called a(n) _____. 

The volume of the ocean’s “container” (the volume of water the ocean can contain) _____. 

Primary producers located at the bottom of the trophic pyramid are eaten by heterotrophs called _____. 

Apart from cyanobacteria, the most productive photosynthetic organisms in plankton are the _____. 

_____ is a group of marine predators that include squids, nautiluses, and octopuses. 

_____, or “tube worms,” are a small phylum of invertebrates that measure 10–13 feet in length and have the diameter of a human arm.