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.​