Answer: With the development of powerful microscopes, scientists discovered many single-celled organisms that didn't fit into any of Linnaeus' kingdoms. As a result, a new taxon, called the domain, was added to the classification system.
Explanation:
The mitochondria and chloroplasts.
Hope I helped! :)
An ectotherm gets its heat from external sources
(Remember "ecto" means outer, "endo" means inner)
Answer:
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