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.

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.

Why should organisms reproduce more offspring than will survive? select all that apply.