The effects<span> of </span>tobacco smoke<span> on the </span>respiratory system<span> include: irritation of the trachea (windpipe) and larynx (voice box) reduced lung function and breathlessness due to swelling and narrowing of the lung airways and excess mucus in the lung passages.</span>
I don't even know the answer sorry
The structure is known as the alveoli
Answer: D. Frameshift mutation
Explanation:
A nonsense mutation is one in which a codon codifying for an amino acid is replaced by a stop codon, resulting in a premature end to translation (e.g. TAT [Tyrosine] >> TAG [stop]).
A missense mutation is one in which a codon is altered in such a way that it ends up codifying for a <em>different</em> amino acid (e.g. AUA [Isoleucine] >> AUG [Methionine]).
A point mutation is any mutation which involves the altering of a single nucleotide (such as the examples given above), <em>regardless</em> of its effect on the resulting protein.
Finally: a frameshift mutation is one which alters the <em>reading frame</em> of a gene, which results in a whole different set of nucleotides being treated as individual codons by the translation machinery. The consequence of this is a significant change in the resulting amino acid sequence. Frameshift mutations may be the result of several mechanisms which include insertions and deletions. The example given in the picture appears to show an example of one such mutation.
"All of the above," would be the est answer to your question.