BIOLOGY - Carbon-14 is a radioisotope of carbon that has a half-life of about 5,730 years. A geologist is using carbon-14 dating on charcoal samples to find the age of ancient forest fires. Match the approximate age to each charcoal sample in the following two questions. Charcoal Sample #1 has 50% of its carbon-14 remaining.
What is the approximate age of Charcoal Sample #1?
Group of answer choices:
A: 12000 years old
B: 3000 years old
C: 6000 years old
D: 18000 years old



Charcoal Sample #2 has 6% of its carbon-14 remaining.

What is the approximate age of Charcoal Sample #2?
Group of answer choices
A: 18000 years old
B: 6000 years old
C: 24000 years old
D: 12000 years old

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Why do bacteria thrive even in hostile environments

Explain the difference between incomplete dominance and codominance