The tree is the "Producer" while caterpillar is "Primary consumer" and the bird is "Secondary consumer".
You can only see certain constellations at certain times of the year
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The cell organellles are visible in the electron microscope, but it is not possible to study the living cells in electron microscope. For study of genetic materials i.e., DNAs and RNAs is poosible through the help of electron microscope. (ANSWER)
Explanation: