A) Homozygous
An organism in which two copies of the gene are identical and are the same allele is called homozygous
The answer is D, The structure was probably functional in some ancestor of the modern organism. Vestigial structures are structures that have remained from ancestors but have no function in modern times.
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Testable and rejectable.
Recorded data may be quantitative or qualitative.
A recessive allele is shown in the phenotype
Worms don't have lungs. They breathe through their skin.
Hope this helps. :)
