A biological cycle with a period of about 24 hours is called a circadian rhythm.
Whose discovery of radium changed the world’s view of the atom?
Answer: It was Marie Curie whose discovery of radium changed the world’s view of the atom. Therefore the correct answer is choice C).
According to Sigmund Freud, human behavior is?
Answer: According to Sigmund Freud, human behaviour is strongly determined by repressed experiences. Therefore the correct answer is choice D).
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C.
The soil in the delta is less fertile, causing fewer plants to grow.
The flooding of the Nile caused silt and nutrients to replenished in the soil every year.
