Which of the following best illustrates the role that gravity played in the in the formation of the solar system? (a) gravity removed excess gas and dust from the cores of the planet (b) gravity pulled particles of dust and gas together to form planes (c) gravity caused the nebula to cool enough for planets to form (d) gravity allowed the nebula to expand and move outward

I’m stuck on this question cuz i’m stupid sksksksk

The science for classifying and naming organisms is known as

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.