Because this element is the basis of organic substances, its unstable isotope, can be used to find the age of organic material found in fossils.

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. label the following topographic map. click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (increments for contour lines is 50 ft).

How many major plates cover the earth

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates