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kumpel [21]
4 years ago
9

Using the diagram above, which layer is the densest?

Biology
1 answer:
maks197457 [2]4 years ago
6 0
A, is the correct answer.

The core is the densest because it is packed with SO much pressure that makes the molecules of nickel and iron(Elements of the core) immovable.
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PLEASE HELP
Marrrta [24]

Answer:

I'm pretty sure that the answer is d :)

Explanation:

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6 0
3 years ago
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How does the body protect itself from the majority of pathogens it encounters?
Veseljchak [2.6K]

Answer:

In general, your body fights disease by keeping things out of your body that are foreign. Your primary defense against pathogenic germs are physical barriers like your skin. You also produce pathogen-destroying chemicals, like lysozyme, found on parts of your body without skin, including your tears and mucus membranes. In response to infection, your immune system springs into action. White blood cells, antibodies, and other mechanisms go to work to rid your body of the foreign invader. The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill. It is made up of various organs, cells and proteins.

Once infected cells have sensed an invading pathogen, they secrete molecules called cytokines and chemokines. These cells are then primed to resist an infection with the invading virus. Cytokines such as interferons activate anti-viral genes in the infected and neighbouring cells.

Microorganisms capable of causing disease—or pathogens—usually enter our bodies through the eyes, mouth, nose, or urogenital openings, or through wounds or bites that breach the skin barrier. Organisms can spread, or be transmitted, by several routes.

The second line of defense is nonspecific resistance that destroys invaders in a generalized way without targeting specific individuals: Phagocytic cells ingest and destroy all microbes that pass into body tissues. For example macrophages are cells derived from monocytes (a type of white blood cell).

If pathogens do manage to enter the body, the body's second line of defense attacks them. The second line of defense includes inflammation, phagocytosis, and fever.

4 0
3 years ago
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Define and explain the difference between dependent and independent variables
Gemiola [76]
Dependant variable is the thing that changes according to the independent variable in the equation. Example;

if y=1 x=4
if y=2 x=5

y+3=x
7 0
3 years ago
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In maize (corn) plants, a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. A
EleoNora [17]

Answer:

Phenotype ratio= 12 colorless : 3 purple : 1 red

Genotype ratio= 1:2:1:2:4:2:1:2:1

Explanation:

According to the given information, the dominant allele "I" is epistatic to P and p alleles and presence of "I" inhibits the expression of both "P" and "p" alleles.

A cross between two heterozygous plants for both locus would give the F2 progeny in 12 colorless: 3 purple: 1 red ratio.

Here, the F2 genotype with "I-G" and "I-gg" would produce colorless kernels while the ones with "ii-G-" would exhibit purple colored kernels. The F2 genotype "iigg" would beak red kernels.

Hence, the phenotype ratio= 12 colorless : 3 purple : 1 red

Genotype ratio would be same as for the mendelian dihybrid cross= 1 IIPP: 2 IIPp :1 IIpp: 2 IiPP :4 IiPp: 2 Iipp: 1 iiPP :2 iiPp: 1 iipp

6 0
4 years ago
Which of the following groups of phase changes occur only when heat energy is removed or released from water.
Alex787 [66]

The answer is; B

When energy is removed from the water, it means that the molecules lose their energy and they move less kinetically. This way, the energy in the molecules cannot overcome the intermolecular forces of attraction and begin to come together. This causes the water to move from a higher energy phase to a lower energy phase (such as from gas - liquid -- solid).


7 0
4 years ago
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