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shepuryov [24]
3 years ago
11

4. 'The fertility increases the population whereas mortality decreases the

Social Studies
2 answers:
son4ous [18]3 years ago
6 0

Explanation:

Fertility, mortality and migration are principal determinants of population growth. Population change depends on the natural increase changes seen in birth rates and the change seen in migration. Changes in population size can be predicted based on changes in fertility (births), mortality (deaths) and migration rates.

Aleks04 [339]3 years ago
5 0

Hey mate! I've taken some notes down that may or may not help ya.

Here:

"Human females are most fertile between teen years and mid-forties.

Human males are usually fertile throughout adulthood, but sperm starts to diminish during middle-age.

The effect of mortality on population structures is to reduce the component of the population in which the mortality occurs. The effect of this is to raise the population in the upper age groups substantially. Women have higher life expectancy than men wherever they live.

The major factors affecting the population are birth, death, and migration. Birth increases the population while death decreases the population. Migration also causes population change. Internal migration does not make any changes but international migration makes the differences in the size of the population.

The rate of natural increase of a population depends on birth and death rates, which are strongly influenced by the population age structure."

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What tests do archaeologists use to determine how old a fossil or artifact is?​
Makovka662 [10]

Answer:

Explanation:The approximate age of ancient artifacts can be determined as long as the artifact is not older than 50,000 years. It’s a technique called carbon-14 dating. All organisms that live on the Earth are based on carbon. This would be wood, plants, animals and of course humans.  

There are three different isotopes of carbon, C-12, C-13, which are stable, and C-14. Carbon-14 is used for dating because it is radioactive and considered unstable. It will decay, or emit radiation, over a long period of time at a near consistent rate. The rate of decay, which can be measured, is 5,730 years equals one half-life.  

Carbon-14, described by Argonne National Laboratory, is produced in Earth’s atmosphere when N-14, Nitrogen, from New World Encyclopedia, atoms are bombarded by cosmic rays from space. They collide with the N-14 atoms and convert them into C-14 atoms. This collision changes a proton into a neutron. The C-14 then combines with oxygen to form carbon dioxide, CO-2. This is then absorbed by plants and animals.  

All living things are replacing their carbon-14 as they continue living. Once they die the dating process begins. The radioactive carbon-14 begins to decay. It is very difficult to date organisms less than 1,000 years old because there is too much carbon-14 present. The same problem happens on the other end of the spectrum when an organism is older then 50,000 years, when there is not enough carbon-14 to measure.  

Accelerated Mass Spectrometry (AMS) as explained by llnl.gov, was started by J.J. Thomson, from Nobel Prize.org, in 1897. “At first there were very few who believed in the existence of these bodies smaller than atoms. I was even told long afterwards by a distinguished physicist who had been present at my (1897) lecture at the Royal Institution that he thought I had been, ‘pulling their legs.” This by Scrips.edu.  

Beginning in the early 1900’s, mass spectrometry has been used to calculate the age of organisms using the carbon-14 isotope. Ions are accelerated in a field of millions of volts and smash through a gas or carbon foil. These ions then come to a stop in a gas ionization detector. Ion identity is determined by how fast they slow down.  

Carbon-14 slows down faster than a nitrogen-14 isotope of the same mass. The AMS is a million times better at detecting the ratio of isotopes, by Colorado Edu,  than by conventional means. It’s this ratio that determines the age of the item tested. The AMS can recognize one carbon-14 isotope among a quadrillion different carbon atoms.  

Dinosaur fossils, by All About Creation, cannot be age tested using the carbon-14 method because they are millions of years old. To determine their age the isotope’s from uranium-238, uranium-235 and potassium-40 are used. They all have a half-life of more than a million years.  

Dinosaur fossils are found in sedimentary rock. The isotope’s needed to determine age are rarely found in sedimentary rock. Those isotopes are found in igneous rock made from cooled magma. No fossils are found in igneous rock because when it forms it would be too hot and destroy the bones. Scientists study neighboring layers of sedimentary rock that was formed at approximately the same time as the igneous rock. This gives them an approximate age of the fossil.  

Using this method, scientists estimate the Earth is about 4.5 billion years old, USGS. Moon rocks are the same age lending weight to the theory that the Earth and Moon formed at the same time.    

4 0
3 years ago
When Congress lowers taxes, the level of total spending in the economy increases.<br> True or False?
soldier1979 [14.2K]

Answer:

True

Explanation:

When taxes are lower, people tend to spend more money. Thus, the total spending in the economy increases.

Brainliest please??

6 0
3 years ago
Read 2 more answers
Research supports the theory that a shift from ____ to ____ can reduce stereotyping and prejudice
Bogdan [553]
<span>Research supports the theory that a shift from automatic processing to controlled processing can reduce stereotyping and prejudice. Automatic thoughts are the thoughts that come into our conscious involuntarily. Controlled processing makes us pay more attention and put effort into our thoughts.</span>
3 0
3 years ago
The ______________ was formed in 1931 to investigate the rising crime rates, which ultimately directed police away from the serv
ycow [4]

Answer:

Wickersham Commission is the correct answer.

Explanation:

Wickersham Commission was a board appointed on the 20th of May in the year 1929 by the president of U.S. herbert hoover.

Wickersham Commission's purpose was to do investigate the problems arising because of crime rates and also to look into the problems in the criminal prosecution system.

3 0
3 years ago
What is thw most common biome in india
vampirchik [111]
<u>tropical rain forest</u>

Hope to help
:D
8 0
3 years ago
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