The pulmonary veins carry oxygen-rich blood between the lungs and the heart.
It is actually the only vein in the boy that carries oxygenated blood. A clue to answering questions about veins is that veins are blood vessels that carry blood towards the heart while arteries carry blood away from the heart.
Alternation of generations is the fluctuation of the diploid and haploid stages in plants. The diploid stage occurs through mitosis while the haploid stage works through meisos and asexual reproduction. In vascular plants, the diploid stage produces seeds. In non-vascular plants, the haploid stage produces the spores.
Answer is Alpha
Aldebaran is designated Alpha Tauri (α Tauri). It is an orange giant star located about 65 light-years from the Sun in the zodiac constellation of Taurus. It is the brightest star in its constellation and usually the fourteenth-brightest star in the night-time sky, though it varies slowly in brightness between magnitude 0.75 and 0.95. It is likely that Aldebaran hosts a planet several times the size of Jupiter.
Answer:
Biosphere comprises all the life that exists on earth including animals, plants, water bodies, microorganisms, algae, fungi etc.
If there would be no biosphere on earth the atmosphere would be quite different. There would be no oxygen to support because oxygen is liberated by plants in photosynthesis so no plants means no oxygen. The earth would be a planet without life just like Venus and Mars. Therefore, no organism would be surviving in the world.
There would be no negligible green house effect and global warming since it is all created due to activities of men.The earth's atmosphere would be much cleaner and with lesser amount of CO2 and O2 but no organism would be there to use them.
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It is famed for the death of the dinosaurs. However, many other organisms perished at the end of the Cretaceous including the ammonites, many flowering plants and the last of the pterosaurs. Some groups had been in decline for several million years before the final event that destroyed them all. It's suggested that the decline was due to flood basalt eruptions affecting the world's climate, combined with drastic falls in sea level.