Answer:
Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.
Birds, Salamanders and Sharks are all Endotherms and can manipulate their body temperatures.
2, because a theory is not a law that can not be changed, and new evidence can change a theory.
The first heart chamber that the dye would enter is right atrium.
This will be followed by
left ventricle
right ventricle
left atrium
coronary valve
