Answer:
a. Mammalia
Explanation:
Mammalia are the class species that have distinct systems and separate ducts for different activities like reproduction, excretory, and defecatory and moreover they have nipples to feed their young ones.
So, the above species which has a single duct for reproductive, excretory, and defecatory material as well as a lack of true nipples does not belong to Mammalia
Specialized cell junctions<span> occur at points of cell-cell and cell-matrix contact in all tissues.</span>
<span>The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called the lithosphere. </span>
Well there are many but the surface of the earth is the material violin one outer core (if that makes sense
Answer:
hey you didn't provide the complete question. what's the full question maybe I could help