The pronoun 'both'

Question

Because they do so many things that seem to prepare them for the approach of winter, plants and animals seem to know that winter's coming, but of course neither knows the future the way human do. So what causes these behavioral changes? According to biologists, both animals and plants are profoundly affected by the decrease in the amount of sunlight they receive in autumn.
Among animals, the change in the day's length and the resulting decrease in sunlight are both registered in the hypothalamus, the master control" gland of the brain. In response, the hypothalamus secretes hormones that trigger chemical reactions throughout the animal's body.
[Source: Reading for Results Ninth Edition by Laraine Flemming]
I'd like to know why "both" is sitting before "registered," not "the change."
Thank you in advance for your help.

Teechr · Accepted Answer

Either position is fine.

Among animals, both the change ... and the resulting ... are registered in the hypothalamus ... etc.
Among animals, the change ... and the resulting ... are both registered in the hypothalamus ... etc.

Park sang joon · Answer

Thank you, teechr, for your kind answer.

Then, I'd like to know if "both" is put at any other position except for "both of the change ... and the resulting."

Teechr · Answer

park sang joonThen, I'd like to know if "both" is put at any other position except for "both of the change ... and the resulting."

In your sentence "both are" won't work.

Have a look at the bottom of this page for the explanation:
http://dictionary.cambridge.org/grammar/british-grammar/both

The pronoun 'both'

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