What is the difference between AM radio waves and FM radio waves? An FM wave varies in amplitude; an AM wave varies in frequency. FM waves are better reflected by particles in the Earth’s atmosphere. AM waves travel short distances along the Earth’s surface; FM waves travel farther. An AM wave varies in amplitude; an FM wave varies in frequency.

Trees with light brown bark dominate an ecosystem the ecosystem has populations of insects that thrive on the tree bark over time some insect species developed certain physical characteristics that them thrive on the tree bark these physical characteristics also the insects defend themselves from predators which insect species is probaly the species with the new physical characteristics?