Kylee has been learning that engineering and technology are beneficial to people. She now sees how the things people synthesize are useful. The useful materials that benefit people are synthesized from

They are synthesized from raw materials

Explanation:

All synthesized products goes through lots of processes. This processes involves the conversion of substances known as raw materials into a more useful and modified form.

These synthesized products are usually more useful and made in order to solve a given problem or offer a particular service. Raw materials are cheaper than the synthesized products and are common in all industries and fields.

it's c. elements are placed in rows based on how may valencies electrons have.