Dna in eukaryotic organisms are found in the nucleus.
You would expect plants to have leaves with little surface area, and develop a different form of carbon storage during photosynthesis that better suits these environments like CAM or C4. They would also have thick cuticles to prevent water loss. Plants in the tundra and the desert generally adapt by growing as low-lying shrubs.
The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.