How have methods for transporting goods changed over time?
how has industrialization and the production of manufactured goods affected trade?
how do government regulations and trading blocs affect trade?
have the benefits of trade changed over time?
how has the construction of canals or roads changed trade routes?

answer all questions.

The models in task 1 had been dalton's, Thomson's, Ruthordord's, and Bohr's.

A gas discharge tube consists of a gas-filled tube equipped with a metal electrode at every end. In this case, the gas used is hydrogen. An electric current is passed through the tube. The electrons in the hydrogen soak up energy from the electric current and get excited to a higher energy level. As the electrons return to their original energy state, known as the ground state, they emit light of a specific color. The shade of the light relies upon on the amount of energy that it carries. This energy is the difference in energy of the excited state and the ground state. Particles of different gases emit light carrying unique amounts of energy and, as a result, different colors. Hydrogen emits four visible colorations of light.

Explanation:

I have the same class, this is just the answer i came up with, hope it helps.