How many lone pairs of electrons are there in a molecule of ozone?

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

What is the cause hearing loss in human being