A scientist is using radiometric dating to determine the ages of four rock samples in order to determine the ages of fossils found near the rocks. The ratios below compare the amount of parent isotopes to the amount of daughter isotopes. Which rock sample is the oldest?

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?