Erich Freytag
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Sep 19, 2022 · There are several theories for how life came to be on Earth. These include: Life emerged from a primordial soup. As a University of Chicago graduate student in 1952, Stanley Miller performed a famous experiment with Harold Urey, a Nobel laureate in chemistry.
May 29, 2024 · The phenomenon of life can be approached in several ways: life as it is known and studied on planet Earth; life imaginable in principle; and life, by hypothesis, that might exist elsewhere in the universe (see extraterrestrial life). As far as is known, life exists only on Earth.
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction
3 days ago · Investigating life on Earth has shown us that all living things need certain elements for their cellular processes, such as growth and metabolism. For instance, the CHNOPS elements (carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur) are known to be part of every living thing.
But we can think in a more informed way about whether life might exist on other planets (and under what conditions) by considering how life may have arisen right here on our own planet. In this article, we'll examine scientific ideas about the origin of life on Earth.
- Clicking on the expandable 'What about Nucleotides?' link revealed an answer to your question. It's noted that "one recent study using a different...
- All life on earth appears to be related — this is based on the presence of ancient genes that are found in (essentially) all living organisms. This...
- Hi, Bintia and thank you for your questions. DNA evolved from RNA, that's our current belief. When i was a student i was constantly searching for s...
- The amino acids that are the base building blocks of life are simple to make. In the 1950's scientists combined ammonia, hydrogen, methane, and wat...
- I assume that's because RNA molecules have many abilities and in general have more diverse functions than proteins. RNA can be a genetic molecule (...
- i know it may look confusing but its how life works.Life keeps going and going and soon we have the animals today and cells help all life stay alive
- We think that any newly originated organism (or proto- organism) would be very unsophisticated and unlikely to survive competition with existing or...
- A quick search of pubmed for the phrase "RNA world" finds 914 papers: https://www.ncbi.nlm.nih.gov/pubmed/?term=%22RNA+world%22 Why do you think re...
- It doesn't go against it. It simply covers something that cell theory doesn't, how primitive cells formed from non-cellular material.
- Stromatolites are buildups of compounds secreted from bacteria. Fossils of microbes would be microbes themselves, not evidence of them.
May 29, 2024 · The origin of life is a result of a supernatural event—that is, one irretrievably beyond the descriptive powers of physics, chemistry, and other science. Life, particularly simple forms, spontaneously and readily arises from nonliving matter in short periods of time, today as in the past.
All living things reproduce, copying their genetic material and passing it on to their offspring. Thus, the ability to copy the molecules that encode genetic information is a key step in the origin of life — without it, life could not exist.
