please answer all questions in full sentences/long detailed response that answer
ID: 298251 • Letter: P
Question
please answer all questions in full sentences/long detailed response that answers all parts to the question:
1.How has the solar brightness, oxygen content of the atmosphere, carbon dioxide content of the atmosphere, and surface temperature of the earth changed over time? Has each increased, decreased, or stayed the same since the Earth formed?
2. Give and describe the two minimum requirements for life?
3. What is evolution? What is natural selection? How are the two concepts related to one another?
Explanation / Answer
1.How has the solar brightness, oxygen content of the atmosphere, carbon dioxide content of the atmosphere, and surface temperature of the earth changed over time? Has each increased, decreased, or stayed the same since the Earth formed?
2. Give and describe the two minimum requirements for life?
1. Liquid water :Water is essential because biochemical reactions take place in water.
Water is also an excellent solvent that easily dissolves and carries nutrients and other compounds in and out of cells.
Our human bodies require more than 60% water.
2. Essential chemicals : As we know Life contains specific combinations of elements including carbon,hydrogen, nitrogen, and oxygen that combine to form proteins and nucleic acids which can replicate genetic code. All the basic elements are formed in stars and distributed throughout space as a result of giant explosions called supernovas. Since these essential chemicals are quite common in other places in the Universe we can expect that the development of life somewhere else is also possible.
3. Energy source: Organisms require energy to put together the chemicals that form an individual. Energy is also required for the organism to grow, reproduce, and respond to the environment. Energy sources may include other organisms, light, or inorganic compounds. The most common source of energy on the Earth is photosynthesis, which transforms sunlight into food. This process will not work very well for the outer Solar System.
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