3. What does the word photoperiod describe? the length of daylight
the tilt of Earth's axis
the time of migration of various animals
the way plants grow

a. or the length of daylight

Explanation:

pho·to·pe·ri·od

/ˈfōdōˌpirēəd/

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nounBOTANY•ZOOLOGY

the period of time each day during which an organism receives illumination; day length.

( this is the definition )

The length of daylight, or also the way the plants grow. depends on what school program you use. Hope it helps :)

Explanation:

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emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.