Answer:
Cats also purr when they are nervous or in pain, leading some experts to believe that this uniquely feline vocalization is actually a method of self-healing. A domestic cat's purr has a frequency of between 25 and 150 Hertz, which happens to be the frequency at which muscles and bones best grow and repair themselves.
Explanation:
Answer: changed by molecular oxygen
Explanation:
Biologically induced molecular oxygen (dioxygen, O2) started to accumulate in Earth's atmosphere and changed Earth's atmosphere from a weakly reducing atmosphere to an oxidizing atmosphere.
The organelle in plants when empty causes wilting is the vacuole. A vacuole in plants cells is very large and surrounded by a membrane and holds materials such as nutrients and waste and helps maintain the proper structure of the plant, less liquid in the vacuole can cause wilting.
