1. Scientist can use the fossil record to determine changes in an environment, what does the abrupt appearance of a new organisms show? The abrupt appearance of a new organisms is evidence of square and square .

The abrupt appearance of a new organism in the fossil record can indicate several things, but the most likely explanations are:<br /><br />1. **Rapid Evolution**: The sudden appearance of a new organism could suggest that there was a rapid evolutionary change in the species. This could be due to a sudden change in the environment, such as a new food source or a change in climate, that allowed the organism to evolve quickly.<br /><br />2. **Speciation**: The abrupt appearance of a new organism could also indicate that a new species has formed. This could happen if a population of organisms became isolated from the rest of the population and evolved independently, eventually becoming a distinct species.<br /><br />So, the abrupt appearance of a new organism in the fossil record shows evidence of **rapid evolution** and **speciation**.