Aristotle gave his view in his book on the science of the ancient world and animals. He said that the world is formed by the blueprints fixed in the mind of God. For ancient animals, he said, the kind of animal with feathers, beak, wings, warm blood, and a hard-shelled egg is called a bird.
The stem cell controversy is the consideration of the ethics of
research involving the development, use, and destruction of human
embryos. Most commonly, this controversy focuses on embryonic stem cells.
Answer:
The most significant experiment performed to date on the formation of organic molecules remains that of Miller and Urey in 1952 when they sought to test the hypothesis of Oparin and Haldane that the organic building blocks of life emerged from a reducing atmosphere (Miller, 1953). Miller filled a flask with the four gaseous elements of the reductive atmosphere: methane, ammonia, hydrogen and water. He then passed electrical discharges through them to simulate lightning. After 125 h of the experiment, using the equipment available to him at the time, Miller identified several alpha amino acids contained within the residues.
In mitosis a cell divides to form two identical daughter cells. It is important that the daughter cells have a copy of every chromosome, so the process involves copying the chromosomes first and then carefully separating the copies to give each new cell a full set. Before mitosis, the chromosomes are copied.
