Copernicus ideas about the solar system are considered to be the starting point of modern astronomy.
The principles of the solar system proposed by Copernicus are regarded as the foundation of contemporary astronomy. The geocentric model, which maintained that Earth was the centre of the universe and that the planets, sun, and stars all circled around it, was the most widely accepted theory of the solar system until Copernicus. This theory was refuted by Copernicus, who put forth the heliocentric theory, which placed the sun at the centre of the solar system and had the planets rotate around it. The groundwork for upcoming astronomical discoveries and hypotheses was set by this, which marked a significant shift in our knowledge of the cosmos.
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How is cytokinesis in plants and animal cells in mitosis different? How is cytokinesis in sperm and egg cells in meiosis different?
1st question;Plant cytokinesis is centrifugal in nature, the cytoplasmic division starts at the center of the cell and moves towards the cell wall. Animal cytokinesis is centripetal in nature, the cytoplasmic division starts at the edges of the cell at the plasma membrane and moves towards the center.
2nd; Gametogenesis differs between the sexes. In the male, the production of mature sperm cells, or spermatogenesis, results in four haploid gametes, whereas, in the female, the production of a mature egg cell, oogenesis, results in just one mature gamete.
Lancelets Are small marine animals. They spend most of their time buried in the sand with their mouth sticking out to filter food from the ocean water. These animals have a body feature called a nerve cord along the back as well as a notochord Guild muscle blocks and a tail. However, they do not have a 
These animals have a body feature called a nerve cord along the back as well as a notochord Guild muscle blocks and a tail. However, they do not have a chordates.
The lancelets (often known as amphioxus and placed in a group known as cephalochordates, of which the best known are in the genus Branchiostoma) are small marine chordates that are most closely related to the vertebrates.
The dorsal nerve cord and chordates has pairs of nerves that connect to the organism's muscles. In some organisms, the dorsal nerve cord expands into a brain at the top.
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