Excerpt from The Origin of Species Charles Darwin
11 must here introduce a short digression. In the case of animals and plants with separated sexes, it is of course obvious that
two individuals must always unite for each birth; but in the case of hermaphrodites this is far from obvious. Nevertheless there is
reason to believe that with all hermaphrodites, two individuals, either occasionally, or habitually, concur for the reproduction of
their kind. This view was long ago doubtfully suggested by Sprengel, Knight, and Kolreuter. We shall presently see its
importance; but I must here treat the subject with extreme brevity, though I have the materials prepared for an ample
discussion
In this sentence from the first paragraph of the passage, what does the word concur mean?
A)
ignore
B)
separate
C)
understand
D)
act together