Which statements can be inferred from the Paleozoic era time scale? There was volcanic activity during the Paleozoic era.
Dinosaurs existed in the middle part of the Paleozoic era.
Marine organisms existed in the early part of the Paleozoic era.
Ammonites existed before the trilobites did during the Paleozoic era
Erosion and deposition were processes that occurred during the Paleozoic era.

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.