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The earliest mentions of Slavic raids across the lower River Danube may be dated to the first half of the 6th century, yet no archaeological evidence of a Slavic settlement in the Balkans could be securely dated before c. 600 AD.

There is no evidence of a Slavic settlement where before c. 600 AD?
Answer: the Balkans
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The Egyptians were one of the first major civilisations to codify design elements in art and architecture. Egyptian blue, also known as calcium copper silicate is a pigment used by Egyptians for thousands of years. It is considered to be the first synthetic pigment. The wall paintings done in the service of the Pharaohs followed a rigid code of visual rules and meanings. Egyptian civilisation is renowned for its colossal pyramids, temples and monumental tombs. Well-known examples are the Pyramid of Djoser designed by ancient architect and engineer Imhotep, the Sphinx, and the temple of Abu Simbel. Modern and contemporary Egyptian art can be as diverse as any works in the world art scene, from the vernacular architecture of Hassan Fathy and Ramses Wissa Wassef, to Mahmoud Mokhtar's sculptures, to the distinctive Coptic iconography of Isaac Fanous. The Cairo Opera House serves as the main performing arts venue in the Egyptian capital.

What is the main performing arts venue in Egyptian capital?
Answer: The Cairo Opera House
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It is now known that the molecular circadian clock can function within a single cell; i.e., it is cell-autonomous. This was shown by Gene Block in isolated mollusk BRNs.[clarification needed] At the same time, different cells may communicate with each other resulting in a synchronised output of electrical signaling. These may interface with endocrine glands of the brain to result in periodic release of hormones. The receptors for these hormones may be located far across the body and synchronise the peripheral clocks of various organs. Thus, the information of the time of the day as relayed by the eyes travels to the clock in the brain, and, through that, clocks in the rest of the body may be synchronised. This is how the timing of, for example, sleep/wake, body temperature, thirst, and appetite are coordinately controlled by the biological clock.[citation needed]

What do body hormone receptors do with the body's organs?
Answer:
synchronise