What animals lay eggs in which green algae live along with the embryo? Detailed answer

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What animals lay eggs in which green algae live along with the embryo? Detailed answer

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What animals lay eggs in which green algae live along with the embryo?

The eggs laid by salamanders are infested with green algae. They supply the embryo with oxygen, and in return they receive nitrogen from the waste products of the embryo. Recently it has been found that this symbiosis is inherited, as the algae's DNA is contained directly in the reproductive organs of adult salamanders.

Authors: Jimmy Wales, Larry Sanger

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What is an obelisk?

An obelisk is a spire carved from stone with a pyramidal top. The first most famous of these monuments were made in Egypt. They are considered real because each of them is carved from a single stone. Some famous memorials in the United States, such as Banner Hill and the Washington Monument, are shaped like an obelisk, but they are made of many small stones.

The Egyptians believed that the obelisk was the seat of the spirit of the Sun. Obelisks were usually made in pairs and placed on either side of the gates in temples and tombs. The tops were usually covered with a shiny metal such as gold to reflect the sun's rays. Inscriptions made in hieroglyphs on four sides praised the pharaohs, at whose command these obelisks were erected.

All Egyptian obelisks are made of granite quarried near Aswan. Some of them were 24 meters high. How could the Egyptians move these huge blocks? Nobody knows for sure. It was estimated that more than 20 people would be needed to pull it. The obelisks were dragged from the quarries to the Nile, then loaded onto barges and transported to different cities. Throughout history, Egyptian obelisks have been scattered around the world. The ancient Romans were simply amazed by them. After the Roman conquest of Egypt in 30 B.C. e. they moved about 15 obelisks to Italy.

Nobody knows how they did it. The obelisk that stands in front of St. Peter's Cathedral in Rome was moved to Rome at this time, and 16 centuries later, in 1585, it was installed in the square in front of the cathedral. This took about a year. In the 1836th century, three obelisks were brought from Egypt. The first was erected on the Place de la Concorde in Paris in 1880. The second obelisk was erected on the banks of the River Thames in London in 1881. The third - in the Central Park of New York City in XNUMX. The London and New York obelisks are called Cleopatra's Needle.

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