what type of fossil forms when the impression from the remains of an organism is filled in with soil and hardens into the shape of the original organism?

The tubes transporting minerals and water upward are called ?

Interferons play a vital role in the immune system why are interferons so important?

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.