HELP ME PLEASE IT IS DUE TOMORROW

Select the correct answer from each drop-down menu. the lac operon in e. coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.

The offspring of a black cat and a white cat is a gray cat, it has the genotype bw if a black cat mates with a gray cat the chance that the offspring is white will be what percent?