Part i: you are given a broth culture that is growing an unknown organism. what is the first test you will do

First, you can inspect the broth specimen. If the bacteria are aerobic, which need oxygen to live, the bacteria will grow in the upper part of the broth. Anaerobic bacteria will grow on the bottom part. The bubble can be produced if the bacteria do fermentation.
Doing gram stain microscopic examination also help much since knowing the gram classification and the morphology of the bacteria.

The Greenhouse Effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere.

Radiatively active gases in a planet's atmosphere radiate energy in all directions.

The level of carbon dioxide in Earth's atmosphere has been rising consistently and is causing temperatures to rise.