red blood cells, white blood cells ,and platelets.
1) red blood cells
2) white blood cells
3) platelets
Answer:
matter
Explanation:
B) Tornado
C) Thunderstorm
Answer:
Maintaining structure.
Explanation:
The cut heals to maintain structure.
Active transport requires energy to move molecules across a cell membrane because it goes against the natural concentration gradient
Because active transport works against the natural concentration gradient, which moves molecules from a region of lower concentration to a region of higher concentration, it requires energy to move molecules across a cell membrane.
To transfer molecules down their concentration gradient (from high to low concentration), passive transport methods like diffusion and assisted diffusion, which don't require energy, are in contrast.
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Answer:
Active transport requires energy because it is not a passive process. The molecule has to go against the concentration gradient. Hence it requires energy to be carried by the carrier proteins.
The energy is used is ATP, which comes from respiration