Identify the keystones from each part of the video and try to also identify the foundation species (plants) that are impacted when the keystones are not present. video: The Serengeti Rules Season 38 Episode 2

https://www. pbs. org/video/the-serengeti-rules-41dfr u/

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.