A team of archaeologists excavating a sedimentary rock layer come across some primitive hunting tools used by early humans. As the dig progresses, they unearth the fossilized remains of a dinosaur from another layer of the sedimentary rock. Why do these discoveries indicate that the rocks were formed over millions of years? A) Early humans appeared on Earth about a million years ago. B) Humans and dinosaurs coexisted about a million years ago. C) Dinosaurs became extinct millions of years before humans appeared. D) Humans hunted dinosaurs and were responsible for their extinction

Explanation:

C) Dinosaurs became extinct millions of years before humans appeared.

Sedimentary rocks are formed by deposition of inorganic minerals and small particles on the surface of the earth. The layers are formed year after year and hence help in determining the age of the rocks.

Carbon dating has proved that dinosaurs became extinct millions of years before the humans came into existence and so presence of their fossils  in different strata of the same rock indicate that the rocks were formed over millions of year.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."