The correct answer is C. Passive transport refers to the movement of substances such as ions across the cell membrane without the use of energy. Examples of such movement is diffusion, facilitated diffusion, osmosis and filtration. The opposite of passive transport is active transport and this needs energy to occur. Examples of active transport are proton pumps, exocytosis and endocytosis.
Answer:
In studying the origin of the universe, one of the primary unanswered questions is <u>what came before the big bang.</u>
Explanation:
The big bang theory can be described as a theory which scientists have proposed to explain how the universe came into existence. This theory predicts how the extremely hot temperatures and dense atmosphere might have given rise to the stars and the galaxies.
Scientists have no idea what happened before the big bang theory. Some scientists predict that there might be another universe which collapsed before the big bang theory. While other scientists claim that there was nothing before the big bang.
<span> el mecanismo es fotosíntesis </span>
Oxygen and glucose are both products of photosynthesis and reactants in cellular respiration. Hope this helps!
Answer: I don't see any pictures...
Explanation:
