If you could spend a billion dollars (1 x 10 to the 9th power) per second, how many years would it take to spend one mole of dollars?

Which element is the least metallic between cadmium, silver, zinc, or iron?

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?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.