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:

eukarya because is is like alche and b is bacteria and d is animals

explanation:

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.