Mr. morales is teaching a lesson on classification. he says that spiders are classified as a different group than insects because they have eight legs instead of six legs. he explains that spiders evolved first. mr. morales also says that having eight legs is the derived trait that separates the two groups. antonio thinks mr. morales is wrong. which piece of information is antonio considering?
spiders do not have eight legs.
insects do not have six legs.
if spiders evolved first, six legs is the derived trait.
spiders do not have derived traits, since they evolved first.

If spiders evolved first, six legs is the derived trait, is the piece of information that Antonio is considering.

This is because a derived trait is a trait possessed by an organism which was not present in its last common ancestor or the structures absent in an organism which was present in the ancestor (this is known as a secondary loss).

This means that if spiders evolved first, then the six legs possessed by the insects should be a derived trait and not the eight legs of the spider.

substitution is the answer in this case

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.