The last three are correct
In an endothermic reaction, energy is absorbed which causes the object to heat up.
Nitrogen fixation is the process by which nitrogen gas from the atmosphere is converted into different compounds that can be used by plants and animals. There are three major ways in which this happens: first, by lightning; second, by industrial methods; finally, by bacteria living in the soil.
Answer:
5 · every skin cell in a human body
