Evolution

Evolution is change in the heritable traits of biological populations over successive generations. Evolutionary processes give rise to diversity at every level of biological organisation, including the levels of species, individual organisms, and molecules.

All life on Earth shares a common ancestor known as the last universal ancestor, which lived approximately 3.5–3.8 billion years ago, although a study in 2015 found "remains of biotic life" from 4.1 billion years ago in ancient rocks in Western Australia. According to one of the researchers, "If life arose relatively quickly on Earth ... then it could be common in the universe."

Repeated formation of new species (speciation), change within species (anagenesis), and loss of species (extinction) throughout the evolutionary history of life on Earth are demonstrated by shared sets of morphological and biochemical traits, including shared DNA sequences. These shared traits are more similar among species that share a more recent common ancestor, and can be used to reconstruct a biological "tree of life" based on evolutionary relationships (phylogenetics), using both existing species and fossils. The fossil record includes a progression from early biogenic graphite, to microbial mat fossils, to fossilized multicellular organisms. Existing patterns of biodiversity have been shaped both by speciation and by extinction. More than 99 percent of all species that ever lived on Earth are estimated to be extinct. Estimates of Earth's current species range from 10 to 14 million, of which about 1.2 million have been documented.

KKnD series

KKnD, or Krush, Kill 'n' Destroy is a series of post-apocalyptic real-time strategy games by Beam Software. KKnD was released in 1997, while a sequel - KKND2: Krossfire was released in 1998. Towards the end of 1997, KKnD Xtreme, an expanded version of the original was released, which featured extra missions and enhancements. Was re-released on GOG.com in 2012.

All games in the series feature a campaign for each of the different factions in each game, alongside multiplayer capabilities.

Games in the series

Story

The year 2079 AD saw the realisation of Mankind's ultimate nightmare: an all-out nuclear war exterminates a quarter of the world's population almost instantly. Infrastructure collapses as mutagenic viruses infect humans and animals alike. Most of the survivors of the attack (aptly named the Survivors) live underground. Those who don't are mutated by the viruses and nuclear fallout (what they call the Evolved). 2141 sees the underground dwellers breaking through to the surface, after living underground for decades. Soon enough, the "Evolved" and "Survivors" meet. The Evolved and the Survivors do battle until the Survivors are surrounded at their underground HQ. The battle ends in a stalemate and both the Evolved and the Survivors retreat to recoup their losses for the next 40 years.