1982 by Robert Jarvik
Four.
It is called irrigation I am 95% positive .
no. 20km is 20000m.
The difference is that artifcial plants are made of silk,plastic,and sun. Real plants you can plant it it has to have water,lots of sun,and soil
Well lots do including cakes and muffins, lollies, coke... The List goes on...:) Any specifics
Scientists had to convert information from amino acids to nucleic acids.
the heart is made from many materials such as muscle.
the heart, the stomach
The heart of vertebrates is made of cardiac muscle.
A lot! It, of course, all depends on what type of artifcial intelligence, and what it is used for, but the more extremes of size (bigger or smaller) it is, the more it costs.
I believe the heart is made out of muscles