Royal jelly, a thick, milky substance secreted by young nurse honeybees to feed a bee colonyâs larvae, most notably the queen larvae, is a rich source of nutrients, as well as acetycholine, a neurotransmitter that plays a critical role in cognitive function.
The origin of the eukaryotic cell is a milestone in the evolution of life, since eukaryotes include all complex cells and almost all multicellular organisms. The timing of this series of events is hard to determine; Knoll (2006) suggests they developed approximately 1.6â2.1 billion years ago.
Prokaryotic cells are believed to have arisen in the Archean Eon about 2500-3800 million years ago. There is fossilized evidence of prokaryotes approximately 3.5 billion yeaâ¦rs ago, during the first billion years after the formation of the Earth.