Get started!
Stage 1
Answer 6 questions correctly in a row.
Read the passage to learn about a group behavior in sockeye salmon.

Sockeye salmon spawning in a stream
Sockeye salmon are found along the west coast of North America, from Oregon to Alaska. These fish have bony projections on their gills to filter out food, like zooplankton and small fish, from the water. Young sockeye salmon spend one to three years living in freshwater before reaching the smolt stage of their development. Then, in the spring, they migrate through rivers to the ocean in groups numbering in the thousands to feed and mature. Their journey isn't an easy one— sockeye salmon smolts have many predators, including gulls, loons, and bull trout. Though smolts are mostly defenseless against predators, the sheer size of their migratory group provides some protection for individuals, since the supply of smolts is higher than predators can consume at once.
As adults, many sockeye salmon complete a second migration, this time from the ocean into freshwater, to spawn. Such fish are called anadromous. Females use their tails to dig nests in which they deposit their eggs, and males swim over the eggs to fertilize them. Males and females both die a few weeks after spawning.
Which claim best describes how a group behavior increases the likelihood of survival for sockeye salmon?
Migrating in a group increases the chances that sockeye salmon smolts will successfully migrate without being eaten by a predator.
Digging nests for eggs with their tails increases the chances that sockeye salmon will produce viable offspring.
Being anadromous increases the chances that sockeye salmon will find enough zooplankton to eat.
Spawning in freshwater increases the chances that sockeye salmon will live in Alaska.
ref_doc_title.
Jumping to stage 1 of 1
Excellent!
Now entering the Challenge Zone—are you ready?