Which of the following best describes the characteristics that differentiate animals from the organisms of other kingdoms?
Animals have chloroplasts, making them autotrophic
O Animals have external digestion and cell walls
O Animals have eukaryotic cells, are multicellular, and heterotrophic.
O Animals have a unique substance called peptidoglycan in their cell membranes.

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.