The Chondrichthyes are the cartilaginous fishes including the sharks, rays,<span>skates and chimeras. The Osteichthyes are the bony fish. Both of these groups </span>became established during the Devonian Period about 400 million years ago. The Chondrichthyes <span>differ from the Osteichthyes in many respects, including their</span><span>
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Answer:
The cosmic microwave background radiation.
This is completely consistent with a fireball event in which the radiation field was in thermal equilibrium, and is perhaps the most convincing evidence for the Big Bang.
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Answer:
Domains
Explanation:
All Biological organism can be classified or placed in a group.
Taxonomy is a branch of science that deals with naming and classification of biological organism based on shared characteristics.
In taxonomy, a domain is the highest order of classification or ranking ,its even higher than the kingdoms.
It is inclusive of all biological grouping.
All cellular organisms can be placed in any of the three domains namely, Bacteria, Archaea and the Eukarya.
Answer:
Secondary level of protein structure
Explanation:
The proteins are formed of the monomer units called amino acids which bond with each other via peptide bond and form a linear peptide structure called the primary level structure of the protein.
The proteins to perform several functions in a cell undergoes structural conformation and attain the helical form called alpha helix due to the involvement of alpha carbon in bond formation and a pleated sheet called beta-pleated sheet due to the involvement of beta carbon. These structures are known as a secondary level of protein structure.
Thus, a Secondary level of protein structure is the correct answer.
