How is radioactive decay used to date sedimentary rocks? The amounts of potassium and argon in sedimentary rocks are measured.
The amounts of carbon-14 and nitrogen in sedimentary rocks are measured.
The amounts of unstable elements in each layer of the sedimentary rocks are compared.
The amounts of unstable elements in the volcanic layers above and below the sedimentary layers are measured

Why is it important that human chromosomes have many origins of replication

Dr. bad has developed a way to damage the atp-binding cassette transporter (abc transporter) on a cell. the cell's abc transporter can no longer bind and use atp when it's transporting substances. which of the following statements best describes how this damage would effect the transport of substances in the affected cell? (choice a) substances at a low concentration outside the cell would be more rapidly transported into the cell, where there is a high concentration. (choice b) substances at a high concentration outside the cell would not be transported into the cell, where there is a low concentration. (choice c) equilibrium would be established between all substances inside and outside of the cell. (choice d) substances at a low concentration outside the cell would not be transported into the cell, where there is a high concentration.

Me with these questions image attached