What is the purpose of the zigzag line on the right side of the periodic table? a) It marks the border between the alkali metals and the transition metals.
b) It indicates a family of elements that have the same chemical properties.
c) It connects the elements in the table that have the same atomic number.
d) It divides the metals and nonmetals, and shows where the metalloids are.

Calculate the number of molecules present in 0.750 mol of mgo.

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone, due to its high light availability and warm water temperature

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.