Why do scientists monitor the effect of each method A- to stop humans from using wood as a resource

B-to prevent global temperatures from rising in the future

C- to study how ecosystems are different in different part of the world

D- to ensure that human have a sustainable supply of wood for the future

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.