A world where life belonged, where symbiosis between nature and environment was the governing evolutionary factor.

Genetic diversity through sexual reproduction is a significant evolutionary factor in resistance to parasites and infectious diseases.

Proposed causes include psychological, psycho-social, hereditary, evolutionary and biological factors.

The evolutionary factors that produced these changes have been the subject of several theories.

Consensus was reached as to which evolutionary factors might influence evolution, but not as to the relative importance of the various factors.

Differences in fertility rates may have become an evolutionary factor relatively recently, Dr. Jones and others say.

Presently only very few species are known where male lactation occurs and it is not well understood what evolutionary factors control the development of this trait.

Think of me as an extra-somatic evolutionary factor.

These block transfers are so extensive that they seem to have been a major evolutionary factor in the genome's present size and architecture.

Now, if we accept that behavior patterns are established by environmental and evolutionary factors, we should begin by examining your past.