4. A
srry thats the only thing i can answer
A : a car driving down a hill
The mitochondria converts food into energy
A major problem in sending space probes to Jupiter is that the planet has no solid surface on which to land, as there is a smooth transition between the planet's atmosphere and its fluid interior. Any probes descending into the atmosphere are eventually crushed by the immense pressures within Jupiter
Enzymes in a reaction act as catalysts. They speed up the chemical reaction process.
