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Only one layer of cells is in focus when using the high power (40x) objective.Therefore, the depth of field is limited to only one layer of cells.The persistent belief is that women are looking for long-term committed relationship and men are looking for short-term sexual relationships.That may be true for younger people, but that isn’t always the case at this age, she says.

The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.

You must focus up and down using the fine adjustment knob on the microscope to see both layers of cells.: Shrinkage of the protoplast or cell contents due to water loss when a drop of salt water (Na Cl) is added to the Elodea slide.

Because of all the salt ions (Na and Cl- ions) outside the cell membrane of each Elodea cell, water molecules move out of the cell membrane causing the cell membrane and it contents to shrink into a blob in the center of the cell wall.

To see how we actually use this information to date rocks, consider the following: Usually, we know the amount, N, of an isotope present today, and the amount of a daughter element produced by decay, D*.

By definition, D* = N-1) (2) Now we can calculate the age if we know the number of daughter atoms produced by decay, D* and the number of parent atoms now present, N.