Which of the following statements are true about measurements and units? a. the si unit is used by scientists all over the world. b. the unit of mass in the si system is the kilogram. c. measurements do not need to include units. d. the english system of measurements is based off of the powers of ten.

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 is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

According to cell theory; which structures carry out the basic function of living things? a. atoms b. organs c. cells b. nuclei