The density of a particular small rubber ball is 1.1 g/cm3. It was dropped into a 100 mL beaker filled with 50 mL each of ethanol and distilled water. Which is the most accurate description of what happened to the rubber ball in the beaker? A. It sank below the ethanol and distilled water. B. It floated on top of the ethanol and distilled water. C. It floated on top of the ethanol, but sank below the distilled water. D. It sank below the ethanol, but floated on top of the distilled water.

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.