What have the Germans done to help clean up space junk? and Different countries have explored or are exploring different methods to clean up space junk. Explain why some methods may be more effective than others?

In natural selection, what is actually “selected? ” a) alleles are directly selected b) genotypes are directly selected c) phenotypes are directly selected d) entire populations are directly selected

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.