The La Brea tar pits in Los Angeles, California are home to many fossils. Until about 11,000 years ago, animals often became trapped in the tar. Their remains sink according to density and become fossilized. Fossils found there include mastodons, giant ground sloths, mammoths, giant camels, dire wolves, and saber-toothed cats, as well as still-living animals such as California condors, squirrels, coyotes, and skunks. Which two statements support the information known about the tar pits and fossils found in them?
A. The tar pits were the cause of extinction for several North American species.
B. Scientists can tell the age of a fossil using the location where scientists find it in the tar pit.
C. The fossils in the tar pits do not appear in chronological order as fossils found in rock layers.
D. The fossils in the tar pits include ancestors of North American species that adapted to survive.​

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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.