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.
Report Abuse. Prokaryotes are unicellular organisms. They appeared first, about 3.5 billion years ago. Eukaryotes first appeared 1.6 million years ago. The first multicellular organism originated around 1.5 million years ago. The first multicellular organism was a sponge.