What is introgressive hybridization and what role might it play in evolution?

What is introgressive hybridization and what role might it play in evolution?

What does Joshua Ledergerg mean when he says "Our only real competition for domination of the planet remains the viruses"?

What does Joshua Ledergerg mean when he says "Our only real competition for domination of the planet remains the viruses"?

Sperm surface protein

Why might a sperm surface protein involved in binding to eggs exhibit the signal of positive selection?

Phylum Characteristics

Phylum Characteristics. See attached file for full problem description.

Why you believe that life could or could not spontaneously arise on this Earth today

In 1953 Stanley Miller shattered the vitalism belief by replicating the conditions on a primitive Earth and thereby beginning the belief in mechanism. OK- if I were to suppose that all life on Earth was totally destroyed today - everything - even the organic molecules that make up life such as sugar, proteins, cellulose, etc., were destroyed. In other words, today's Earth would have just the inorganic compounds that exist on all planets - most likely spinning around all stars - salts, gases such as ammonia, carbon dioxide, water, etc. There would be no organic compounds on Earth - just rock, water, sand, minerals - much like the nature of Earth several billions of years ago. now assuming... click for more