What is the best explanation for the observation that eukaryotes that seem superficially simple can have much larger genomes (in terms of mass or number of base pairs) than organisms that have complex anatomy, structure, or behavior?
a. Alternative splicing and overlapping genes are rampant among eukaryotes.
b. Some organisms have a tremendous amount of noncoding DNA, like repetitive sequences.
c. Simpler organisms require more chemical defenses against enemies.
d. Animals with simple body plans are adapted for rapid DNA replication.

b. Some organisms have a tremendous amount of noncoding DNA, like repetitive sequences.

Explanation:

Eukaryotes looks superficially simple but when we look at the genome of eukaryotes it is seen that it is more complex and much larger than organism who have complex anatomy, structure, and behavior because a large amount of their human genome contains non-coading genes or sequences like introns and repetitive DNA sequence which do not code for any protein.

Therefore the complexity in eukaryotic DNA is because of the noncoding sequence which makes a large amount of eukaryotic genome. So the right answer is b.

age range would be the answer

i dont know it at allnow im just getting points at this pint