Crossing over . a. involves centrioles b. involves breakages and exchanges between sister chromatids c. occurs during mitosis d. only occurs in animal cells. e. results in new combinations of alleles being channeled into the daughter cells

Aperson who uses a computer at a desk does not have to worry about safety in the workplace. true or false

During a hot day, warm and moist air rises and cools in the atmosphere. which even would occur next on such a day? a. condensed droplets would gather to become water vapor. b. water vapor would condense into tiny droplets. c. water droplets would evaporate to form rain and snow.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic