Environmentally devastating aspects of shrimp trawling include destruction of the bottom as the trawls drag across it and also deposition of giant piles of dead by-catch on the sea floor 

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

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:   Excess nutrients added to the ecosystem can increase growth of algae that outcompete the dominant structure-providing organisms 

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

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

Large eyes are a consistent feature of fishes that live in the very low  light conditions of the mesopelagic.

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)

Low biomass of algae on a coral reef that is teeming with large schools of herbivorous fishes could indicate that the herbivores are consuming the algae as quickly as it is growing, i.e., the primary productivity might be high even though the standing biomass is low.

Which of the following is a drug of choice for male baldness?

What information should the nurse provide a client newly prescribed propylthiouracil (PTU) about its primary mode of action?