Which statement is true of viroids?
they are single-stranded rna particles.
they reproduce only outside of the cell.
they produce proteins.
they affect both plants and animals.

Viroids are single-stranded RNA particles

Explanation:

Viroids are acellular particles of small circular single-stranded RNA, doesn't have its genomic material in a capsule. This RNA don’t codify proteins, they only replicate autonomously. Viroids can’t reproduce of their own, they must need host cells for its reproduction. Most of them are infectious particles causing damage to cultivated plants making an important impact on agriculture.

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.