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Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.

At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.

Even the shortest-lived massive stars last longer than the entire span of human history, so how can astronomers test the predictions of their stellar evolution models?

, download the common English mistakes file here for use in class: I have added explanations to most of the mistakes. App Shed is a free online app-creation tool where anyone can design and publish mobile apps for i OS, Android and web.In this day and age, learning resources have moved online.Choose from a wide variety of interactive learning help, such as activity instructions, games, guided lessons, and good old-fashioned worksheets.Regardless of how nice or beautiful a scientific theory may appear, if it does not make accurate testable predictions, it is invalid.

When color-magnitude (H-R) diagrams for star clusters are constructed, there is a convincing confirmation of our stellar evolution models.

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.

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Chronological Analysis of the Scriptures- Literal interpretation of the scriptures led some people to conclude that the Earth was created approximately 6,000 years old.

Only one layer of cells is in focus when using the high power (40x) objective.