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2 years ago

Carbon 4 sublimes at a negative 78 degrees Celsius .It 8s called dry ice why is it called dry ice

1 answer:

4 0

Sublimation is a straight transition from solid to gas. This occurs in dry ice as it the ice, which is a solid state, does melt and have a liquid form. Therefore it is called dry ice as it doesn’t produce any liquid

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Place the following events from the Civil War in the correct order with the numbers in the drop down

Over [174]

Answer:

lee surrendered (3)

Lincoln assassinated (4)

Union forces captured Richmond (2)

Sherman made March to the Sea (1)

Explanation: i just did it

7 0

3 years ago

Read 2 more answers

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Oksi-84 [34.3K]

Answer:

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Bottlenecks and founder effects

Genetic drift can cause big losses of genetic variation for small populations.

Population bottlenecks occur when a population's size is reduced for at least one generation. Because genetic drift acts more quickly to reduce genetic variation in small populations, undergoing a bottleneck can reduce a population's genetic variation by a lot, even if the bottleneck doesn't last for very many generations. This is illustrated by the bags of marbles shown below, where, in generation 2, an unusually small draw creates a bottleneck.

Loss of genetic variation as a result of a population bottleneck

Download this graphic from the Image library.

Reduced genetic variation means that the population may not be able to adapt to new selection pressures, such as climatic change or a shift in available resources, because the genetic variation that selection would act on may have already drifted out of the population.

Elephant seal

An example of a bottleneck

Northern elephant seals have reduced genetic variation probably because of a population bottleneck humans inflicted on them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000 — but their genes still carry the marks of this bottleneck: they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.

Founder effects

A founder effect occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have:

reduced genetic variation from the original population.

a non-random sample of the genes in the original population.

For example, the Afrikaner population of Dutch settlers in South Africa is descended mainly from a few colonists. Today, the Afrikaner population has an unusually high frequency of the gene that causes Huntington's disease, because those original Dutch colonists just happened to carry that gene with unusually high frequency. This effect is easy to recognize in genetic diseases, but of course, the frequencies of all sorts of genes are affected by founder events.

Explanation:

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3 years ago

Name this organism? Is this organism prokaryotic or eukaryotic?

AlladinOne [14]

Answer:

Prokaryotes

Explanation:

Prokaryotes are organisms that consist of a single prokaryotic cell. Eukaryotic cells are found in plants, animals, fungi, and protists. They range from 10–100 μm in diameter, and their DNA is contained within a membrane-bound nucleus.

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4 0

2 years ago

Rosa drew a flow chart of the carbon cycle. Flow chart of the carbon cycle with 4 boxes connected by arrows. Box 1: carbon dioxi

leonid [27]

Answer:

(a) X: Producers undergo photosynthesis. Y: Decomposers return carbon to the soil and release waste.

Explanation:

(a) X: Producers undergo photosynthesis. Y: Decomposers return carbon to the soil and release waste.

(b) X: Decomposers return carbon to the soil and release waste. Y: Producers undergo photosynthesis.

(c) X: Decomposers take in carbon dioxide. Y: Producers absorb carbon through their roots.

(d)X: Producers absorb carbon through their roots. Y: Decomposers take in carbon dioxide.

Box 2 (X) would be the process through which producers fix carbon dioxide to produce their own food, the carbohydrate. The process is otherwise known as photosynthesis and can be represented by the following equation:

$6CO_2 + 6H_20 --> C_6H_1_2O_6 + 6O_2$

Box 4 (Y) would be the process of decomposition. Both producers and consumers eventually die and decompose in the soil. During this process, some of the carbon returns to the soil as organic matters while the process of microbial decomposition releases carbon dioxide into the atmosphere.

The correct option would be (a).

3 0

3 years ago

Fever ________. Group of answer choices: a) decreases the metabolic rate of the body to conserve energy b) causes the liver to r

Alisiya [41]

Answer:

Fever c) is regulated by chemicals that reset the body's thermostat to a higher setting

Explanation:

Fever is a high body temperature and is one of the ways our immune system attempts to combat an infection. It is also referred to as pyrexia and it could be more than between 37.2 and 38.3 °C (99.0 and 100.9 °F) in humans, there is not a single agreed-upon upper limit. Temperature is regulated in the hypothalamus. Fever helps your immune system fight infections by speeding up the functioning of cells and it makes it harder for bacteria and viruses to thrive in the body.

3 0

3 years ago

Carbon 4 sublimes at a negative 78 degrees Celsius .It 8s called dry ice why is it called dry ice ​

Carbon 4 sublimes at a negative 78 degrees Celsius .It 8s called dry ice why is it called dry ice