What is the evidence that plants and animals had a common ancestor?
Posted by aditsu, at biology.stackexchange.com,
According to the theory of evolution (which I don't dispute), plants and animals evolved from a common ancestor, probably a…
Why are there not two trees of life?
Posted by Isky Mathews, at biology.stackexchange.com,
Life on earth started an estimated 3.8 billion years ago, very soon (in geological time) after the earth’s surface cooled to…
What makes our words different than symbols like X?
Posted by Uğur Erdem Seyfi, at philosophy.stackexchange.com,
There is an issue that blurs my head. For instance, lets have a proposition p that says: “X is round”. X is a symbol that we…
What Proteins Are Universal To All Life Forms?
Posted by Dale, at biology.stackexchange.com,
According to National Geographic, there are 23 proteins that are common to all life forms: All species in all three domains…