Answer:
Revolving Service Structure (RSS) of launch pad 39B
Multi cellular organisms are composed of many cells whereas unicellular organisms are composed of single cell. Multicellularity is indeed a progressive attribute of evolution where cells form tissue which forms organ and then organ system and finally an organism. Both multi cellular and unicellular organisms has advantages and disadvantages of their own. One of the main disadvantage of multi cellular organisms is that due to such a complex composition and functioning they require a large amount of energy for their maintenance and survival. Different organs and system require a huge amount of energy when it comes to comparison with unicellular organisms. A large amount of energy is also wasted in all these life processes. Though multi cellular organisms can survive in a variety of environmental conditions but then also their survival is difficult than any unicellular organism.
A compass
The Earth's magnetic field, provided by the magnet in a compass, shows the direction of the north and south poles.
ANSWER MADE BY AN AI
The cell membrane gateway system you are looking for is called <span>Sodium Potassium Pump.</span>
