A 40-year-old woman has a greater probability of giving birth to a child with Down syndrome than a 25-year-old woman because the 40-year-old woman is more likely to produce a flawed egg due to body aging, leading to chromosomal abnormalities. have eggs that suffer genetic mutations, leading to recessive illnesses. experience more exposure to harmful environmental influences, leading to faulty cell division. fail to produce eggs rapidly enough, leading to eggs that are not fully developed at the time of ovulation.

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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.