External respiration (correct answer) involves the exchange of oxygen and carbon dioxide within the environment.
The exchange of wastes through the skin is just called excretion by sweating.
There is no exchange of nutrients that occur in the lungs but rather absorption of nutrients is the function of the gastrointestinal tract.
The exchange of oxygen and carbon dioxide within the cell is called cellular respiration and involves carrying oxygen from the blood to the cell then the cell uses it as the final electron acceptor in the electron transport chain. The metabolic wastes of the cell, primarily carbon dioxide, goes now to the bloodstream to be exchanged for oxygen in the lungs.
I think the answer is Traction
Answer:
Two-element compounds are usually ionic when one element is a metal and the other is a non-metal.
Explanation:
sodium chloride: NaCl, with Na+ and Cl- ions
lithium nitride: Li3N, with Li+ and N3- ions
magnesium oxide: MgO, with Mg2+ and O2- ions
calcium phosphide: Ca3P2, with Ca2+ and P3- ions
Option A and D are totally incorrect because the cell and mitochondria and chloroplast are co dependent on each other.
We can say that the eukaryotic cell provides protection to mitochondria and chloroplast and in turn they provide energy.
Option C is incorrect too because prokaryotes being inferior to Eukaryotes ,cannot engulf them.
So in my opinion option B should be correct because of endosymbiosis theory which says that Superior cells engulf the prokaryotes without digesting them. So that the prokaryotes living inside the eukaryote can provide it energy and the superior cell provides the protection to the inferior one.
hope u get it, thank you
