What is the difference between physical properties and chemical properties of matter? A. physical properties are recognized when substances react with one another, while chemical properties do not change the composition of matter,
B. physical properties cannot be studied, while chemical properties of matter can be studied
C. physical and chemical properties are the same thing
D. physical properties do not change the composition of matter, while chemical properties can be recognized only when substances react or don't react with one another

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.