MRNA has a complex secondary structure; 3D. While tRNA is more like an X figure.
Autotroph is an organism that can produce its own food using water ......
But because Autotrophs produce their own food , they are sometimes called producers .
So you can say Autotroph or producer .
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Starch can't be used by the organism the way it is, because cells aren't able to do anything with it.
If you break it into glucose though, it becomes usable.
Hope it helped,
BioTeacher101