Ten years ago, the ratio of birds to snakes in a local desert ecosystem was 2: 5. over the last 10 years, disease and hunting by humans has cut the bird population in half. the snake population has not changed. what is the current ratio of birds to snakes in this local ecosystem?
a.
2: 2.5
b.
2: 5
c.
1: 5
d.
1: 2

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

How is the electron sea model of metallic bonding different from the band theory? how are they the same? give at least one similarity and one difference between the models

Island arcs island arcs are long, curved chains of oceanic islands associated with seismic activity and mountain-building processes at certain plate boundaries. they occur where oceanic tectonic plates collide. along one side of these island arcs, there is usually a long, narrow deep-sea trench. at island arcs, the denser plate is subducted and is forced into the partially molten mantle under the less dense plate. the islands are composed of the extrusive igneous rocks basalt and andesite. the basalt originates most likely from the plastic mantle. the andesite originates most likely from the melting of parts of the descending plate and sediments that had accumulated on its surface. which list identifies minerals present in andesite from the greatest percentage by volume to the least percentage by volume?