|the colloidal and liquid substance of which cells are formed, the cytoplasm and nucleus: no longer in technical use|
|natural selection that favors altruistic behavior toward close relatives resulting in an increase in the individual's genetic contribution to the gene pool|
fertility fer·til·i·ty (fər-tĭl'ĭ-tē)
The state of being fertile, especially the ability to produce young.
|fertile (fûr'tl) Pronunciation Key