An inherent characteristic of humans is the tendency to group together objects or beings that have similar characteristics. Primitive man, for example, already distributed living things into two groups: edible and inedible. The distribution of objects or beings into groups according to their similarities and differences is what is called classification.
From 1900 until about 1920, adherents of Mendelian genetics believed that only mutations were responsible for evolution and that natural selection was not important in this process. After that several scientists began to reconcile the ideas of natural selection with the facts of genetics, which culminated in the formulation of the synthetic theory of evolution, sometimes also called neodarwinism.
What determines speciation at a molecular level? At what point does a scientist determine two lineages are different enough to be considered separate species? Does it have a margin of error?
I'm a guy and I decided to donate blood because of persuasion. My testicles feel weak afterwards specifically. I mean they feel like they're compensating -- assuming that makes sense. Is this beca…
I know that human proteins are synthesized using only 20 different amino acids. However, how can there be thousands of different proteins in human cells, if we only use 20 amino acids to make them?
