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The experience of a phytoplanktonic organism with a low Reynold’s number swimming through water could be compared to the feeling of a human:

High productivity characterizes several marine ecosystems, but specific attributes that contribute to high productivity are not necessarily the same in all 5 systems.  From the list below, choose the best description of how productivity can be high in each ecosystem.   deep sea hydrothermal vents

Choose the ecosystem that is best described by each of the following sentences:        habitat structure is ephemeral, being continuously built and destroyed by water movement and as organisms interact with each other 

Food webs are one way to organize a lot of information about an ecosystem in a way that can help us to understand the dynamics of the system.  Please choose the ecosystem that is described by each of the following phrases:   Very large predators (i.e., that feed on the predators that consume herbivores) help maintain health of the ecosystem 

Although echinoderms have no brains and their internal structure is somewhat informal, they often play important roles in ecosystems.  For each of the following roles described below, please choose the system corresponding in which an echinoderm species plays that role:     consume fast-growing algae that would otherwise overgrow the dominant structure-producing organisms 

Super high rates of production are found in the intertidal zone on white sand beaches.  

Two very different benthic systems in the deep sea are:  deep sea sediment communities and deep sea hydrothermal vent communities.  Indicate which of these communities is described best by each of the following phrases       higher standing biomass  (per square meter)

Pelagic fishes often have dark tops and white bottoms to confuse predators – with this counter-shading pattern they can simultaneously confuse birds that are looking down and larger pelagic fishes that are looking up

Choose the ecosystem that is best described by each of the following sentences:        complex mating rituals and mutually beneficial associations are mediated in large part by colors and color patterns of the participating mobile organisms  

Although echinoderms have no brains and their internal structure is somewhat informal, they often play important roles in ecosystems.  For each of the following roles described below, please choose the system corresponding in which an echinoderm species plays that role:     consume the dominant structure-producing organisms