The electrons that travel through electron transport chain #1 (and that have been excited off of the chlorophyll molecules on photosystem #2) are used to

Acommon kind of mechanical weathering is called

What is used as a template during replication? a- mrna b- trna c- rrna d- dna

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.