Answer:
astronauts are brought back to by a Soyuz capsule. The Soyuz capsule has a curved ablative heat shield that is used to prevent heat from building up and penetrating the crew cabin.
Answer: plants such as trees convert carbon dioxide into oxygen, which gives the earth a constant supply of oxygen.
Explanation:
It's Mutualism, since they share a mutual relationship
The activation energy of a given chemical reaction is the minimum required amount of energy needed to start the reaction, for the reaction to start. All reactions have an activation energy, even spontaneous ones, ones that do occur spontaneously. It is a thermodynamic barrier that separates the amount of energy reactant molecules must possess to ultimately react with each other to produce the respective products.
