The ld 50 is a number scientists use in research to determine the dose of a toxin required to kill 50% of a population of organisms. biologists in louisiana have become concerned about cadmium levels in the water near new orleans, and the chance that frogs will die out. scientists have performed an experiment on bullfrog tadpoles in louisiana and the results are presented in the graph. the ld 50 for bullfrogs is reached a) at about 6 mg per gallon per day. b) at about 60% of surviving tadpoles. c) somewhere around 11 mg per gallon per day. d) somewhere between 2 mg and 3 mg per gallon per day.

Would really appreciate it, i have an idea but not completely sure

Building glycogen from glucose molecules is an example of what

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?