Select all the true statements about density: (hint - there are 4 correct statements) d=m/v (denisty equals mass divided by volume)

density is measured in meters

density is the ratio of an objects mass to its volume

objects that are heavy for their size are very dense

objects that are heavy for their size are not dense

density is how much matter is in a given amount of space

all dense objects will float

(there is more then 1 answer by the way)

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.