I have Erica Meltzer’s SAT Grammar book and one of the fixing sentences questions is:
The roundscale spearfish and the white marlin are two (separate, if closely related, species.)
a) separate, if closely related, species
b) separate species, although being closely related
c) separate species, but also closely related
d) separate species, whereas they are related closely
e) separate species, although their relationship is a close one
The answer is A, but I don’t understand the meaning of the word “if” in this sentence. Does it mean something similar to “but”?