Complete the following sentences.

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

a. is related to the phase of the moon
b. is related to the temperature of the air
c. happens daily
d. happens seasonally

2. during migration, animals undertake a

a. seasonal movement.
b. repeating daily cycle of behavior.
c. sleeplike state.
d. search for new permanent habits.

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

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

wegner's theory did not explain how the continents could move

explanation: