The system is like a chemistry lab which breaks down complex proteins and starches into simple chemicals

a : circulatory

b : excretory

c : digestive

What best describes the structure of the declaration of independence?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

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.