Which of the following traits of complex multicellular organisms is also shared by some simple multicellular organisms but not by single-celled organisms? 
Definitions:
Neonate
Newborn individual.
Amniotic Fluid
The protective liquid contained within the amniotic sac that surrounds and cushions the fetus during pregnancy.
Carbon Dioxide
This odorless, color-free gas is produced during the combustion of organic compounds and carbon, as well as through respiration, and it's consumed by plants in their photosynthesis process.
Chorion
The outermost membrane surrounding an embryo in mammals, birds, and reptiles, contributing to the formation of the placenta in mammals.
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