-
This 150-million-year event happened in which Earth was pummeled by debris
-
The space debris was able to make common organic molecules and create life; CHONPS + energy = life
-
Life on Earth consisted of single cells for billions of years
-
Single-cells began taking on specialized roles and working together in various arrangements
-
Two cells began to live together, exchanging some sort of substrate or metabolite
-
once free-living prokaryotic cells were swallowed up by a primitive host cell, but were not digested
-
Endosymbiosis led to the evolution of multicellular organisms
-
Multicellularity evolved in several different lineages probably by the specialization of the cells by colonial protists
-
Now eukaryotes contain a nucleus and are broken down into 4 kingdoms: Plantae, Fungi, Animalia, and Protista
