How much of the original 200. mL of stomach acid (in mL) is neutralized by the 4.2880 g crushed sample of the tablet

Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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.