Which of the following best summarizes what microbes can do for us based on the text A Brief Study of Guts"? (7 points) They come in many forms within and outside of our bodies.
They help us overcome the effects of antibiotics.
They help process nutrients and vitamins our bodies need.
They work to keep our bodies healthy and resistant to disease.

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.