what happened as a result of Bergmann and Feeney’s discovery of sponge-produced anticancer compounds in the 1950’s

Depending on the organism the number of in a cell may change

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?

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.