Passive transport is the movement of molecules through cell membranes with out the use of energy by the cell
Osmosis is an example of Passive Transport.
Diffusion, Osmosis, and facilitated diffusion.
active transport is when cells must move materials in an opposite direction against concentration gradient. it requires energy. passive doesn't require energy. like a balloon , when u blow it up it requires energy and when u left the air go out it doesn't.
There is no such thing as a "trasport number".
A bicycle
ummm... their feet?
Astronauts use space shuttles( trasport people and equipment), Space probes (robotic exploration, Spacecrafts (trasport crew, equipment, and other technologies)
Astronauts use space shuttles( trasport people and equipment), Space probes (robotic exploration, Spacecrafts (trasport crew, equipment, and other technologies)
Active transport requires energy (ATP, GTP, etc) to work against the electrochemical gradient. Passive transport works with the electrochemical gradient and does not require energy. (Think diffusion)
it saves trasport costs it saves time to the company
Passive
yes they came before steam engines