The primary source of energy for all mammals is a simple sugar.

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.

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

In the controversial scientific process of cloning, organisms are created that are genetically identical to there parent. this process would be classified as