Crossing-over can occur during meiosis I in: a. prophase I.
b. metaphase I.
c. anaphase I.
d. telophase I.

Which strategy is an example of how companies may upgrade themselves to meet changing customer preferences? a.doing door-to-door sellingb.using billboards to advertise the productsc. making online shopping services availabled.giving discounts on products

Scientists discover two populations of mice on either side of a major river. the two populations have almost identical genes but the mice from one side cannot breed with mice from the other. this is most likely because

This is the nitrogenous base only found in rna