If an animal is an ectotherm, it's has 1. a skeleton on the outside of its body 2. a skeleton on the inside of its body 3. a body that regulates its own internal temperature 4. a body that does not produce much internal heat

How are fossils used to date organisms?

Transposon can cause mutations in genes at or near the site of transposon insertion. it is possible for these elements to transpose away from their original site, causing a reversion of the mutant phenotype. in some cases, however, even more severe phenotypes appear when these elements excise from this site, due to events at or near the mutant allele. what might be happening to the transposon or the nearby gene to create more severe mutations?

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