<p>(Located on) the firefly’s lower abdomen (is) a mass of luminescent cells in which oxygen (combines) with a substance called luciferin (to produce) the insect’s distinctive glow.</p>
<p>The answer is E. Why is it not B? When I see a rearranged sentence structure as such, I invert it, giving: A mass of luminescent cells is located on the firefly’s lower abdomen. Should Is not be changed to are?</p>
<p>Mass is singular therefore is is correct
Of luminescent cells is in the genetive case and thus cannot be the subject</p>
<p>Sent from my iPhone using [URL=<a href=“Tapatalk”>Tapatalk]Tapatalk[/URL</a>]</p>
<p>Would 'of luminescent cell’s still be in the ‘genetive case’, as you suggest, in the case of this sentence?
A number of luminescent cells are(is) located on the firefly’s lower abdomen.</p>
<p>Yea anytime a noun is in possessive case(preceded by of or (ex bob’s) )it is in the genetive case. Also btw genitive case is what we refer to them in Latin. Sorry about that condusion
Also a number is pl so it should be “are”</p>
<p>Sent from my iPhone using [URL=<a href=“Tapatalk”>Tapatalk]Tapatalk[/URL</a>]</p>