Answer:
B. introns; exons
Explanation:
Related genes from different organism usually translate to proteins of indispensable functions. This means that the proteins must be similar in terms of amino acids produced. Therefore the coding region must be highly conserved. These can be found in the introns. Conversely, exons are not a part of the coding sequence and therefore not required for translation. These sequences may be less conserved.
1 is b or 1/4 (I'd recommend checking a punnet square too)
The small particles of rock or the remains of living things that make up sedimentary rocks are called cement<span>.</span>
