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Complete the following sentences.

  1. The appearances of fireflies at dusk is an example of a circadian rhythm because it's ______.

AIs related to the phase of the moon
BIs related to the temperature of the air
CHappens daily
DHappens seasonally

  1. During migration, animals undertake a _______.

ASeasonal movement.
BRepeating daily cycle of behavior.
CSleeplike state.
DSearch for new permanent habits.

Verified Answer :

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  1. The appearances of fireflies at dusk is an example of a circadian rhythm because it's happens daily. The correct option among all the options that are given in the question is the third option or option "c".

    2. During migration, animals undertake a seasonal movement. The correct option among all the options that are given in the question is the first option or option "a".

Answer:

1. Option C

2. Option A

Explanation:

1. A circadian rhythm is basically a cycle of processes (physiological, chemical, and behavioral) that repeats itself after every twenty four hours or in other word it occurs daily. Some of the common examples of circadian rhythm are -  

a) Cycle of sleep and wake

b) Cycle of food digestion etc.

The appearance of fireflies at dusk is an event that happens every day and hence it is a circadian rhythm.

2. Almost all the migrating animals migrate based on the season. For instance, birds migrating long distance are travelling to cope up with the seasonal changes. For instance, some of these birds breed in temperate or Arctic during the summer season and during autumn season they return back to the warm south regions


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