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N76 [4]
2 years ago
14

1. Laura uses a cotton swab to collect microorganisms from a hand rail and streaks a plate. On the fourth day of incubation, she

does not observe visible microbial growth. Given that microorganisms are literally everywhere, give at least three reasons why Laura may not have observed microbial growth?
Biology
1 answer:
weeeeeb [17]2 years ago
3 0

Answer:

The Laura tried to grow micro-organisms in culture broth medium in Petri-plates but the microbial growth was not observed even on the fourth day of culture which could be due to:

1. Laura could have not provided the correct broth medium maintaining the with pH and salt concentrations.

2. Microorganisms did not get optimal growth conditions.

3. The bacterial source could have died after the collection which could have lysed after their death and thus no longer visible.

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Answer:

The answer is probably going to be D

Explanation:

The reason is because there are only a little food and then you have a variation of the same spices.  

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Answer:

Sympathetic nervous system

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There is dilation of the pupil, and an increased rate of heartbeat and increased blood pressure. Other responses include dilation of airways and dilation of blood vessels that supply blood to skeletal muscles, heart muscles, liver, etc. Under the given emergency condition, the sympathetic nervous system of Meghan was activated to generate the fight or flight response.

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2 years ago
Risk-taking has been shown to be affected at a BAL of __________.
Nastasia [14]

The correct option is A.

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The full meaning of BAL is blood alchol level. Blood alcohol level refers to the amount of alcohol that is present is a specific quantity of one's blood. As the quantity of alcohol one is taking in increasing the BAL also increases and this affect the way one behave. At the BAL of 0.10, one's ability to think and to judge is severely affected thus making one to become prone to unnecessary risk taking behavior.

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A geologist is studying an ancient stack of rock layers. Most of the layers contain fossils of shallow marine creatures (clams,
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Answer: The environment changed suddenly from a shallow ocean setting to a river system.

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