Which metal can be obtain from calvertie ores?

How much energy moves onto the next level, in an energy pyramid

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.