What does it mean if gram-negative bacteria are found in the sample? why would they be present in the sample?

See explanation

Explanation:

In yogurt are usually found, (several ) types of gram- positive bacteria. Those bacterias are used to made yogurt, and don't bring negative effects on the human body. These bacterias are Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus bacteria.

When doing a gram-staining on a yogurt sample, this staining will show a positive result if there are gram- positive bacteria present, what is most likely to happen.

In a yogurt sample, normally, no gram-negative bacteria will occur. Although, if gram - negative bacteria will be found. This means the yogurt sample is infected. Those bacteria are (probably) diarrhea causing bacteria such as E. coli and Salmonella.

If gram-negative bacteria are found in the sample, the gram-staining will be negative and show red/pink bacteria.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.