Hoà tan x gam NaCl vào 180g nước thu được dung dịch NaCl 10%. a) Tính khối lượng của NaCl đã pha.
b) Tính khối lượng dung dịch NaCl sau khi pha.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

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

Which of the following describes a situation where competition between producers exists