Calculate the rates off radioactive decay if the following percentages of radioactive material is found in fossils or rocks
1. C14 at 65%
2. C14 at 15%
3. K40 at 30%
4. K40 at 15%

Click the item in the left column. use the plus sign to move it up or the minus sign to move it down until it matches the correct entry in the right column. lock your answer in place by clicking the square beside the item. (a checkmark means it is locked.) amazon basin a atacama desert b andes mountains c lake titicaca d peru e patagonia f brazil g chile h suriname

How many structures do prokaryotic cells have in common with the eukaryotic cells? a. 2b. 3c. 4d. 5

In the diagram, δgef and δhef are congruent. what is the value of x?