Explanation:
The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula. The Sun formed in the center, and the planets formed in a thin disk orbiting around it. In a similar manner, moons formed orbiting the gas giant planets.
Answer:
Health care workers who work with blood or other bodily secretions which may carry the HBV virus must receive a free HBV vaccination.
If theres no plants then the animals that eat those plants die then the animal the eats that animal die and so on. Hope this helps!