Since invasive species did not co-evolve with the other species in the ecosystem where they were introduced a. they can unbalance the ecosystem b. they are considered a serious environmental problem c. they lack natural predators to control their population d. all of the above

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Describe how an electric generator works

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?