You have selected the following prediction to test: previously thinned forests will have higher tree survival than adjacent forests that were not thinned. now you need to define the key variables that you will use to test this prediction. for the following variables, sort them as independent variables, dependent variables, or variables that should be controlled (held constant). see the hints for more information about variables. view available hint(s) reset thinning or no thinning before the fire elevation of the site dominant tree species tree survival rate after the fire independent variable | | dependent variable controlled variable thinning or no thinning before the fire elevation of the sitedominant tree species tree survival rate after the fire independent variable dependent variable controlled variable

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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