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3 years ago

What is the trend of human population growth?

Biology

1 answer:

swat323 years ago

6 0

Answer:

Global human population growth is around 75 million annually, or 1.1% per year. The global population has grown from 1 billion in 1800 to 7 billion in 2012.

Explanation:

he “population growth rate” is the rate at which the number of individuals in a population increases in a given time period as a fraction of the initial population. Specifically, population growth rate refers to the change in population over a time period, often expressed as a percentage of the number of individuals in the population at the beginning of that period. This can be written as the formula:

population

growth

rate

Globally, the growth rate of the human population has been declining since 1962 and 1963, when it was 2.20% per annum. In 2009, the estimated annual growth rate was 1.1%. The CIA World Factbook gives the world annual birthrate, mortality rate, and growth rate as 1.89%, 0.79%, and 1.096% respectively. The last 100 years have seen a rapid increase in population due to medical advances and massive increase in agricultural productivity.

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Which type of traits vary quantitatively due to the interaction of multiple genes? polygenic codominant incomplete dominant domi

Gekata [30.6K]

Answer:

1. Polygenic

2. RW

Explanation:

1. A polygenic trait is regulated by more than one gene. The phenotype of the organism is regulated by sum total of all the dominant alleles of these genes. Therefore, these traits exhibit continuous variations and are called quantitative traits. Skin color in humans is an example as it is regulated by more than one genes and the phenotype is determined by total dominant alleles of these genes.

2. If allele R gives red phenotype and the W gives white phenotype, a cross between RR (red) and WW (white) would produce all the cows with RW genotype. The parent cow with RR genotype would form all the gametes with R allele while all the gametes from WW parent would have one copy of the W allele. The random fusion of gametes with R and W alleles would produce progeny with RW genotype.

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il63 [147K]

Answer:

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3 years ago

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Climax communities __________________communities that are undergoing primary succession.

Svetlanka [38]

the answer is are usually more rich in species biodiversity than

and i also found this page that can also help you https://www.cram.com/flashcards/biology-final-6634401

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3 years ago

Clostridium botulinum is a bacterium that produces botulinum toxin that inhibits the release of acetylcholine. Which description

Dimas [21]

Answer:

muscle cells will become paralyzed when there is a lack of acetylcholine

Explanation:

Based on the information provided within the question it can be said that in this scenario the muscle cells will become paralyzed when there is a lack of acetylcholine. That is because the Acetylcholine (ACh) is an organic chemical within the brain and body that acts as a neurotransmitter to send signals from the brain to the muscle cells. Without those signals the muscle cells cannot respond and are therefore paralyzed.

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Which of the following is NOT a freshwater ecosystem? a . a river b . a lake c . an estuary d . a stream

JulijaS [17]

They are all freshwater. So the closest would be c. an estuary since it has a free connection with the sea since the sea is not freshwater.
So C.
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