In the nucleus, the cell copies the dna blueprint to rna. like dna, rna has four nitrogen bases, but in rna, the base replaces the base thymine.

a) alanine
b) guanine
c) uracil
eliminate
d) valine

Wind energy is plentiful in regions with vast open spaces it is a non polluting renewable resource what could be an economic factor that makes the use of this resource less feasible then non renewable resource even in such regions

The buildup of sediments where a river empties into a slow-moving or nonmoving body of water is known as a/an

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.