The assisted transport of a molecule through the cell membrane in deprived of expenditure of energy is facilitated transport. It transports molecules via specific trans membrane integral proteins because of being passive the facilitated transport does not directly require chemical energy from ATP hydrolysis in the conveyance step itself but rather molecules and ions move down their concentration gradient.
The answer would be B. Abiotic Factors. The prefix a means not, so a biotic means not alive. Hope that helped :D
The four main parts are:
Heart
Blood vessels
Blood
Lymphatic system
Hope that helps <span>
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