Which of these particles is an atom of an element?

What are charcteristics of lithosphere?

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

Which blood cell spend most of their time in the lymphatic system?