Question

researchers studying magnetoreception have determined why some soil - dwelling nematodes in the southern hemisphere move in the opposite direction of earth’s magnetic field when searching for ______ in the northern hemisphere, the magnetic field points down, into the ground, but in the southern hemisphere, it points up, toward the surface and away from worms’ food sources.

16 ► mark for review
which choice completes the text so that it conforms to the conventions of standard english?
a food:
b food,
c food while
d food

Explanation:

The question is about choosing the correct option to complete a text in standard English. Looking at the context, the sentence structure likely requires a simple noun form without extra punctuation or words. Option D ("food") is the most appropriate as it's a plain noun, fitting the context of "searching for food" without unnecessary additions like colons, periods, or "while".

Answer:

D. food