Answer:
fossil species- must be old relative to the time of origin of the extant clade.
Single-celled microorganisms that can exist either as independent (free-living) organisms or as parasites (dependent on another organism for life). The plural of bacterium
Answer:
Bacterial: a microscopic, single-celled organisms that thrive in diverse environments.
fossil Species: the fossil species must be old relative to the time of origin of the extant clade (common ancestor).
Explanation:
