You will measure your pulse during three different activities. First, measure your pulse at rest and then while doing two activities of your choice. For the best variety, choose a moderately intense activity such as walking, followed by a more strenuous activity such as jogging or aerobics. Choose activities that you can sustain for 10 minutes. These activities can be performed indoors or outdoors. If you have limited space, you can perform the activities in place. Write down your two activity choices.

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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Other organisms can change their behavior to take the place of the plants in the ecosystem.