امتحان ساينس- رابعة ابتدائي - مقرر اكتوبر -الوحدة الاولى

.................collect information and send it to the brain.

The ............. in Mesopotamia   created the cuneiform writing.

.........is a pattern that has a specific meaning agreed upon by the sender and receiver.

The ability of beetles to emit light flashes is a kind of .....................................

The ............. invented papyrus paper for writing.

Humpback whales make music in series of phrases in a pattern during................................... months.

In ancient times, people used .......... to communicate over long distances using the sense of sight.

............ consists of many parts that work together to transfer information from one place to another.

Glow beetles belong to flying insects .

..........is created by vibrating objects forward or backward in a form of sound

..........is the sensation of a sound wave's frequency.

Humans can communicate with fireflies using flashes.

......is the number of waves  that pass through a specific point in a specific time.

The Mayans made paper from ...........coated with lime.

If .......... sound waves pass through the same point, the wave will have a higher frequency.