Biology, 22.04.2020 00:42 tonyanayy

What is the take-home message? a. Removing even a few lionfish helps native fish recover. b. Removing just a few lionfish does not help much; many of the invasive fish must be removed to help native fish recover. c. Removing even a great amount of lionfish does not help native fish recover. d. The biologists must find another way.

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Answer from: cheeraly09

The question is incomplete. The complete question is as following:

Conservation biologists are scrambling to put measures in place to contain the spread of lionfish. For example, Stephanie Green and colleagues measured how quickly the number of native fish would recover if varying numbers of lionfish were removed from reefs in the Bahamas. They randomly assigned 24 reefs to one of four groups and plotted the proportional change in the number native fish at six-month intervals after different amounts of lionfish (0%, 25%, 75%, or 95%) were removed. (In the graph that follows, values above 1 on the y-axis represent amounts that exceed those at the start of the study in 2009, while values below 1 indicate declines.) Compare the percentage of native fish observed in June 2011 after 25 percent versus 95 percent of lionfish were removed. What is the take-home message?

a.Removing even a few lionfish helps native fish recover.

b.Removing just a few lionfish does not help much; many of the invasive fish must be removed to help native fish recover.

c.Removing even a great amount of lionfish does not help native fish recover.

d.The biologists must find another way.

Explanation:

The June 2011 green (top) data point indicates a proportional shift of about 1.7, which means that the native fish population shows very good recovery by about 70 per cent when 95 per cent of the lionfish were eliminated. By comparison, the orange (bottommost) data point at June 2011 indicates a relative shift of about 0.5, which means that when only a quarter of the lionfish were removed the native fish population decreased by about 50 percent (a result that was almost the same as when none of the lionfish were removed).

Hence, the correct option is B.

Answer from: Quest

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.

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