The upright pyramid of number cannot be seen with ecosystem.
ALake
BGrassland
CPond
DForest
Answer:
D. Forest
Read Explanation:
Pyramid of numbers represents the number of individuals per unit area at various trophic levels.
It is always upright in grassland, pond and lake ecosystems.
But in a forest, it is a partly upright pyramid of numbers because the number of producers are lesser in number and support a greater number of herbivores and which in turn support a fewer number of carnivores.