Окончание "-s" как показатель числа, падежа и лица

All Belarusian citizens are equal before the law, they enjoy equal rights and equal duties.The Belarus’s population is less than 10 million now.Their laboratory occupies a separate part of the building.Назовите эти существительные.Natural rubber is of higher quality than that produced artificially.These factors taken together ensure high production efficiency.The pictures painted by Rembrant and those painted by Rubens have very little in common.There is more water in Lake Baikal than in the Baltic Sea.Read the text.Then read the titles.