Concepts: grass, graze, sheep, tree
A: Sheep grazing on a green hillside in the grass with trees and small hills in the distance.
Concepts: celebrate, day, medal, rower
A: rowers celebrate their gold medal during day .
Concepts: cover, crop, plastic
A: modern agriculture with the use of plastic to cover crops
Concepts: level, number, organism
A:
a pyramid of numbers shows the numbers of individual organisms at each trophic level in an ecosystem .