A: Taxon.
The terms order and class both refer to 2 specific levels that are a part of Linnaeus' classification systems.
Answer:
B. Sends and receives signals throughout the body.
C
Explanation:
Took it on Ed 2020
Anatomical or molecular homologous structures
It is pH. If you have a pH of 0-6 it is a acidic. If you have a pH of 7 it is neutral. If you have a pH of 8 or above it is a base.