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balu736 [363]
3 years ago
5

Pellagra is caused by a deficiency of _____.

Biology
1 answer:
likoan [24]3 years ago
5 0
Vitamin niacin ( vitamin B3)
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Discuss possible disturbances and their cause in an ecosystem​
KonstantinChe [14]
In ecology, a disturbance is a temporary change in environmental conditions that causes a pronounced change in an ecosystem.
Disturbances often act quickly and with great effect, to alter the physical structure or arrangement of biotic and abiotic elements.
Disturbance can also occur over a long period of time and can impact the biodiversity within an ecosystem.
Major ecological disturbances may include fires, flooding, storms, insect outbreaks and trampling.
Earthquakes, various types of volcanic eruptions, tsunami, firestorms, impact events, climate change, and the devastating effects of human impact on the environment (anthropogenic disturbances) such as clearcutting, forest clearing and the introduction of invasive species can be considered major disturbances.
Not only invasive species can have a profound effect on an ecosystem, but also naturally occurring species can cause disturbance by their behavior.
Disturbance forces can have profound immediate effects on ecosystems and can, accordingly, greatly alter the natural community. Because of these and the impacts on populations, disturbance determines the future shifts in dominance, various species successively becoming dominant as their life history characteristics, and associated life-forms, are exhibited over time.
4 0
3 years ago
What organ of the body is the first to receive the nutrients after they pass through the gi tract, and then prepares those nutri
kykrilka [37]

It should be noted that the organ of the body is the first to receive the nutrients after they pass through the gi tract,  is small intestine.

<h3>What is small intestine?</h3>

small intestine  can be regarded as an organ in the gastrointestinal tract and its this organ that enable absorption of nutrients from food takes place. and then prepares those nutrients for use in the body.

Learn more about small intestine at:

brainly.com/question/24864502

3 0
2 years ago
Read 2 more answers
Mosquitoes can carry and transmit many diseases to humans. In the past, the insecticide DDT was heavily used to reduce mosquito
lara [203]

Answer:

Evolution takes place every generation of a species. The more rapid a species procreates the quicker it can respond to percieved threats & challenges in its environment. This is why insects, rodents, bacteria, and viruses can more readily adapt to chemical sprays or agents that are used to kill it. Mosquitos and DDT are such prime example of adaptation; mosquitos that survived DDT became more immune to its effects through genetic changes for each generation exposed.

Explanation:

3 0
3 years ago
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Describe how water
Alla [95]

Explanation:

Epipelagic zone, the topmost at the surface of the oceans receives most of the sunlight and most penetrating light rays diffuse in this layer. The temperatures at this zone, therefore, is warmer than zones below. This zone has lowest water pressure becaue there is little water column above it.

The deeper you get into the water the penetration of sunlight decreases. This is because the rays are greatly diffused even before they get to the deepest zones. The abyssalpelagic zone virtually receives no sunlight because the rays cannot get to this zone. This zone is, therefore, pitch dark and also the coldest. The deeper you get into the ocean the higher the water pressure due to the weight of the able water column. The water pressure is, therefore, highest in the  abyssalpelagic zone.

Learn More:

For more on zones of the ocean check out;

brainly.com/question/7538381

brainly.com/question/13945129

brainly.com/question/11214732

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#LearnWithBrainly

4 0
3 years ago
Which of the following is an example of how the principle of beneficence can be applied to a study employing human subjects?
Furkat [3]

Answer:

Determining that the study has a maximization of benefits and a minimization of risks.

Explanation:

8 0
3 years ago
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