Which of the following elements will form +4 ions? а
Gallium
b Germanium
C Calcium
d Magnesium

Gymnast always perform on padded mats. how does the mats protect the gymnast

How are isotopes of the same chemical element alike? how are they different?

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