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Nonamiya [84]
3 years ago
13

In 1900, there were approximately 1.75 billion humans on earth; in 1950, there were approximately 2.3 billion; in the year 2025,

approximately 8 billion people will inhabit the biosphere. in the period between 1900 and 2025, what has happened to the human population?
Biology
1 answer:
trapecia [35]3 years ago
7 0
<span>The number of humans on earth is experiencing exponential growth. The amount of growth is proportional to the amount of humans on earth to begin with; the more humans there are, the more growth there will be.</span>
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You are a molecule of phosphorus. Choose a starting point in the process you would go through to move through the entire cycle.
noname [10]

Answer:

First I'd be found in rocks. Erosion would wash me into the soil. Then I'd be absorbed by plants, fungi or microorganisms so they can grow. Animals would get me by eating the plants or drinking the water that eroded the rock. The plants and animals die and I'm absorbed back into the soil.

Explanation:

Phosphorus Cycle Steps

The phosphorus cycle is a slow process, which involves five key steps.

Weathering

Since the main source of phosphorus is found in rocks, the first step of the phosphorus cycle involves the extraction of phosphorus from the rocks by weathering. Weather events, such as rain and other sources of erosion, result in phosphorus being washed into the soil.

Absorption by Plants and Animals

Once in the soil, plants, fungi, and microorganisms are able to absorb phosphorus and grow. In addition, phosphorus can also be washed into the local water systems. Plants can also directly absorb phosphorus from the water and grow. In addition to plants, animals also obtain phosphorus from drinking water and eating plants.

Return to the Environment via Decomposition

When plants and animals die, decomposition results in the return of phosphorus back to the environment via the water or soil.  

Plants and animals in these environments can then use this phosphorus, and step 2 of the cycle is repeated.

Human Impact on the Phosphorus Cycle

Humans have had a significant impact on the phosphorus cycle due to a variety of human activities, such as the use of fertilizer, the distribution of food products, and artificial eutrophication. Fertilizers containing phosphorus add to the phosphorus levels in the soil and are particularly detrimental when such products are washed into local aquatic ecosystems. When phosphorus is added to waters at a rate typically achieved by natural processes, it is referred to as natural eutrophication. A natural supply of phosphorus over time provides nutrients to the water and serves to increase the productivity of that particular ecosystem. However, when foods are shipped from farms to cities, the substantial levels of Phosphorus that is drained into the water systems is called artificial or anthropogenic eutrophication. When levels of phosphorus are too high, the overabundance of plant nutrients serves to drive the excessive growth of algae. However, these algae die or form algae blooms, which are toxic to the plants and animals in the ecosystem. Thus, human activities serve to harm aquatic ecosystems, whenever excess amounts of phosphorus are leached into the water.

8 0
2 years ago
Help needed thx btw.
xeze [42]
Which of the following amino acids can function as a neurotransmitter in the CNS?

1. Glutamic Acid it's because the vital inhibitory neurotransmitter in the CNS.

2. Huntington’s chorea has been linked with a deficiency in the amino acid ______.

Gaba  because its the chief inhibitory neurotransmitter in the mammalian central nervous system. 

3. Which of the following is not considered a monoamine?

Adenosine this has nothing to do with neurotransmitters that's linked to the heart.
7 0
3 years ago
Who first came up with the idea of tragedy of the commons?
Arlecino [84]

Lloyd came up with the idea of Tragedy of the Commons

3 0
2 years ago
How does the cardiovascular system helps the body get rid of carbon dioxide???
dem82 [27]
Http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072434/ 

There is a website with some info. Hope it helps! :)


6 0
3 years ago
Microscopic organisms that are disease-causing agents are called
kogti [31]
The answer is C. Pathogens
6 0
3 years ago
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