Carbonâ€"14 is a radioactive isotope that decays exponentially at a rate of 0. 0124 percent a year. How many years will it take for carbonâ€"14 to decay to 10 percent of its original amount? The equation for exponential decay is At = A0eâ€"rt. A. 8. 06 years B. 18. 57 years C. 8,064. 52 years D. 18,569. 23 years.

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.

Approximately what wavelength of light is best absorbed by chlorophyll a