EASY AND FAST QUESTION! Wild salmon begin their lives after hatching in rivers and streams, then migrate to the ocean, where they spend the next 2-8 years, travelling hundreds of miles in large schools. Here salmon feed on small fish, krill, and crustaceans. They then return to the river or stream they were born in to spawn (reproduce).

Question: Describe some advantages and disadvantages of the group behavior exhibited by salmon.

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas