In the eastern region of the former soviet union, a railroad was built on the tundra. the surface soil was dug up and tracks were laid down over the ground beneath. within a year the ground shifted and buckled and the tracks could not be used. using your understanding of the tundra, explain what probably happened.

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

How are fossils most commonly formed

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.