While exploring a coal mine, scientists found plant fossils in the ceiling of the mine which had been preserved by an earthquake. samples taken from one of the fossils have carbon-14 activities of 40.0 counts/min. a reference sample of the same size, from a plant alive today, has a carbon-14 activity of 160.0 counts/min. if carbon-14 has a half-life of 5730 years, what is the age of the plant fossil in years?

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.