What causes Colored Objects?

Color is the attraction. Rainbow, autumn, foliage and flowers is one example. How does the one noun (e.g. leaves) has a green color while the other objects have color orange (carrots for example)? If seen from its chemical structure, leaves are green because of chlorophyll and carrot orange because it has a beta carotene. If seen from the structure of the molecule, chlorophyll and beta carotene have a molecular structure as shown in Figure 1.

the molecular structure of beta carotene and chlorophyll
Figure 1. The molecular structure of beta carotene, chlorophyll (a) and (b)
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