Because most but not all 13 yrs olds and older smoke already and they just want to know if you have already smoked before
Answer:
The correct choice is ''ion electrochemical gradients''.
Diffusion of ions across membranes through specific ion channels is driven by <u>ion electrochemical gradients</u>.
Explanation:
An electrochemical gradient can be considered as that electrical (electrostatic pressure) and chemical (diffusion) force that determine the movement of molecules and ions across the membrane. This electrochemical gradient, in addition to causing movement of substances through cell membranes, is also a type of potential energy available for the performance of different cellular activities, potential energy called membrane potential.
Facilitated diffusion but I might be wrong
The answer for this will be C an integration of organ systems this is because the endocrine system also works with the nervous system and immune system etc
Layers of fossils in pillars, the rock covering them is dated and we get an exact time of each layer.
