A food chain with its pyramid of number. Energy is lost to the surroundings from one level to the next, so there are usually fewer organisms at each level in this food chain. A lot of clover is ...

The population pyramid displays the population composition in the Netherlands per year. For each age, the number of men is shown on the left and the number of women on the right. The pyramid contains ...

While pyramids are synonymous with Ancient Egypt, the world's largest collection of pyramids belongs to another, less visited ...