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3 years ago

What characteristics of skin make it unpleasant for most bacteria?

Biology

1 answer:

Svetach [21]3 years ago

3 0

Answer:

a. All of these

Explanation:

<em>The characteristic of skin that makes it unpleasant for most bacteria would be due to all of the conditions.</em>

Most bacteria require humid condition in order to grow and as such, the desiccated nature of the normal human skin makes it difficult for them to establish themselves and grow on it.

The pH of the skin is usually acidic due to the production of lactic acid during sweating and the activities of the normal skin bacteria. The acidic pH hinders the growth of bacteria that can potentially become pathogenic to the skin.

Also, the skin produce antimicrobial substances at low pH which hinders the growth of pathogenic bacteria.

Hence, options b, c, and d are correct.

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How does the structure of alveoli maximize gas exchange?

Bumek [7]

Answer:

The alveoli are sacks coated on their inner wall by white and sticky liquid, they can be more than a millimeter in diameter and surface active agent. In them there is the exchange of gases between O2 and CO2.

They are evaginations of the epithelium of the air ducts with a single opening for the gases to exit and enter, controlled by the action of a smooth muscle sphincter. Its walls, called alveolar septa, provide a large increase in the exchange surface.

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4 years ago

Are melting glaciers natural disasters or human made

Anna11 [10]

Answer:

Natural disasters, but we probably still made some

Explanation:

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4 years ago

Read 2 more answers

You are testing a new sugar replacement that you think is indigestible (and potentially useful in diet products). You feed 1 gra

enyata [817]

Answer: The % digestibility of the sugar alternative is 10.

Explanation:

First we have to know how many grams of the sugar replacement were in the total rat feces. We know 22,5% of the feces were the sugar replacement, so we use cross multiplication for that:

If 20 grams is 100% of the feces, then

x grams / 22.5% = 20grams / 100%

xgrams = (22.5 . 20grams) / 100% = 4.5grams

If each rat ingested 1gram of the sugar replacement, all five rats ate a total of 5grams.

Now we have to check how much of this sugar replacement was digested. If the rats ate 5grams and 4.5grams were present in their feces

5grams - 4.5grams = 0.5grams

This means they digested 0.5grams.

We use cross multiplication again to find out which percentage of the initial sugar replacement this represents.

If 5grams is 100% of the ingested sugar replacement, then

x% / 0.5grams = 100% / 5grams

x% = (0.5grams . 100%) / 5grams = 10%

5 0

3 years ago

Widespread of hunting predators may result in

Alla [95]

More widely available food chain for other predators, an increase in population of the prey.

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3 years ago

The United States ranks 50th in the world for maternal mortality and 41st among industrialized nations for infant mortality rate

siniylev [52]

Answer:

Answer is B. Ensuring early and adequate prenatal care.

Explanation:

Prenatal care can be described as the care, such as information and medical care , given to pregnant women during pregnancy , before delivery.

This is very important , because it prevents complications during pregnancy, which can lead to maternal mortality, and support the birth of healthy children.

Infant mortality is the death of the child at birth or shortly after, while maternal mortality is the death of pregnant women during pregnancy or shortly after delivery.

Therefore, ensuring early and adequate prenatal care is the best factor that must be put in place to address the issue of maternal mortality and infant mortality rate.

4 0

3 years ago