Why might introduction of exotic species disrupt and ecosystem?

Imagine that a mouse has white fur because of a mutation in its dna. which of the following conclusions can be drawn

What was the land like over 500 million years ago? what was under the sea?

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.