A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.
Answer:
an object will not move unless you exert some force on it
Micro-organisms can spread to person to person
A plant needs sunlight to grow, it also needs carbon dioxide, and water. The plant needs sun so it can make oxygen for animals and us, but also it gives it stuff to make glucose witch it needs. The plant needs it to survive.
