There is a small village in a mountain valley in spain where a largenumber of people are polydactyl (have more than fivefingers or toes)why does this trait tend to be passed on from generation to generation? pleassse hep

How is an environment able to support different varieties of organisms?

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.

Which blood cell spend most of their time in the lymphatic system?