The second largest crater in the world was formed by the impact of a comet according to a 2014 study by researchers in Canada and Ireland. Colliding with Earth almost 1.85 billion years ago, the estimated diameter of the crater is 81 miles (130 km).
How big is a bacteria compared to a human cell? The size of a typical bacterial cell is 0.5-5.0 micrometers, a average human cell is 10 micrometers.8 people found this useful.Edit.he consensus among biologists is that only 5 to 10% of the trillions of cells in our bodies are human. The rest are alien cells: yeast, fungi, bacteria, viruses.
Best Answer: Bacteria are single cell microscopic organisms & are everywhere Parasites are a organisms that feed off others for their own benefit. Viruses are a microscopic particles that can infect the cells of a biological organism.Basically they can all make you sick in one way or another.The main difference is that bacteria and viruses are not considered true life forms while parasites are.iruses are a microscopic particles that can infect the cells of a biological organism. Basically they can all make you sick in one way or another. The main difference is that bacteria and viruses are not considered true life forms while parasites are.