Paragraphs 4-5 contribute to the development of ideas in the text because they explain how the gene drive changes mosquitoes’ DNA, as stated in option B.
<h3>What are paragraphs 4-5 about?</h3>
After reading paragraphs 4-5 of the text "Gene editing wiped out a population of mosquitoes in lab tests," we can tell they contribute the development of ideas by explaining how the gene drive works.
According to the information in paragraphs 4-5, the gene drive is used to change mosquitoes' DNA so that the female mosquito will not bite or procreate. By doing so, scientists would help prevent the spread of malaria, since it is through biting that the female mosquito transmits the disease.
With the information above in mind, we can choose option B as the correct answer.
The missing paragraphs 4-5 are the following:
The researchers changed the mosquitoes’ genes with a gene drive. Gene drives use the molecular “scissors” known as CRISPR/Cas9 to copy and paste themselves into an organism’s DNA at precise locations. They’re designed to break the rules of inheritance. They can quickly spread a genetic tweak to all offspring.
The new gene drive breaks a mosquito gene called doubles∈x. Female mosquitoes that inherit two copies of the broken gene develop like males. They are unable to bite or lay eggs. Being unable to bite means they can’t spread the malaria parasite. Males and females that inherit only one copy of the disrupted gene develop normally and are fertile. Males don’t bite, whether they have the gene drive or not.
Learn more about genes here:
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The pair of verb forms which correctly completes the sentence is the following one:
A. are; appears.
The complete sentence would look like this:
"Mercury and Venus are relatively close to the sun, and neither Mercury nor Venus appears to support life."
In the first clause, the subject is formed by "Mercury and Venus", which means it is plural, and therefore it requires a plural verb (<em>Mercury and Venus</em> are= <em>They</em> are).
In the second clause, there is a neither...nor construction, and both elements which form the subject (again, <em>Mercury and Venus</em>, but this time used in the construction <u>neither</u><u><em> Mercury </em></u><u>nor</u><u><em> Venus</em></u>) are singular nouns, which means a singular verb must be used: neither Mercury nor Venus <em>appears</em>.
Four ghost are in a christmas carol
These two excerpts talk about the terrible problems people in Central America are living day in and day out. Violence, crime and corruption are common in that part of the world. The right answer is letter B. They both describe situations in which people are expected to commit crimes or face violence.
