Answer: the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.
Explanation:
Requires energy input from a cell and enables A cell to move a substance against its concentration gradient
This is true because it's self pollination
Answer:
Explanation:
What is the momentum of a 1,200-kilogram car traveling at 15 meters per second due east? =1200kg V-15m5 29.
