13 Explain the relationship between cells, tissues, organs, and organ systems in a
multicellular organism.

Key points. Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive. ... Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.

Exchange of knowledge occurred between European and Islamic Societies

Explanation:

Between the period of 800 AD – 1258 AD , Islamic societies experienced the golden age of Islam.

During this period, Islamic countries embraced the development of science and technologies along with massive improvement in their economy and political relationships.

This make many people from Europe decided to travel to cities like Baghdad or Alexandria to study and improve their knowledge. When they done learning and got back to Europe, it ignite renewed interest in learning in European society. This lead to the Renaissance period in  1300 – 1600 AD where a lot of cultural and scientific development were pursued in Europe