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miskamm [114]
3 years ago
11

WHY DO SOME PEOPLE HAVE BROWN HAIR?

Biology
2 answers:
ddd [48]3 years ago
3 0
Melanin is a pigment found in your skin and hair<span> cells that gives each its color. It does seem weird that the sun bleaches our </span>hair<span> and darkens our skin. This mostly has to do with </span>hair<span> being dead and skin being alive. the sun bleaches and destroys the melanin in your </span>hair<span> giving you lighter </span><span>hair</span>
faust18 [17]3 years ago
3 0
Genes/DNA

So if your Dad and Brown hair but your Mom has blonde your mostly likely going  to have brown hair because you get most of your Genes from your Dad.
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Complete each sentence by putting the labels to the appropriate blanks. Then place each sentence in a logical order beginning wi
sergij07 [2.7K]

Answer:

c. Beginning with the return from the systemic circulation, blood enters the <em>right atrium. </em>

a. Blood enters the right ventricle from the right atrium through the right atrioventricular valve which is also known as the <em>tricuspid valve</em>

d. The right ventricle contracts next, which forces blood up through the right semilunar valve which is otherwise known as the <em>pulmonary valve .</em>

e. After circulating through the <em>pulmonary capillaries</em>, the blood returns to the <em>left atrium. </em>

f. From the left atrium, blood moves through the left <em>atrioventricular valve </em>which is also referred to as the <em>bicuspid</em> or mitral valve.

b. From the left ventricle, the blood is pumped up to <em>aorta</em> the through the left semilunar valve which is sometimes referred to as the <em>aortic valve</em>.

Explanation:

c. Beginning with the return from the systemic circulation, blood enters the <em>right atrium. </em>

a. Blood enters the right ventricle from the right atrium through the right atrioventricular valve which is also known as the <em>tricuspid valve</em>

d. The right ventricle contracts next, which forces blood up through the right semilunar valve which is otherwise known as the <em>pulmonary valve .</em>

e. After circulating through the <em>pulmonary capillaries</em>, the blood returns to the <em>left atrium. </em>

f. From the left atrium, blood moves through the left <em>atrioventricular valve </em>which is also referred to as the <em>bicuspid</em> or mitral valve.

b. From the left ventricle, the blood is pumped up to <em>aorta</em> the through the left semilunar valve which is sometimes referred to as the <em>aortic valve</em>.

3 0
3 years ago
What caused the Kingdom of Life to change? Give 3 reasons minimum.​
docker41 [41]

Answer:

Due evolution, discoveries and having both characteristics.

Explanation:

The Kingdom of Life change due to evolution in the body of organisms, discoveries of new organisms that are different from plants and animals. There are some organisms that have both plant and animal characteristics so it can't be placed in plant or animal kingdom so that's why the kingdom of life changes from two kingdom system to 5 kingdom system.

3 0
3 years ago
What would lead to competition as a population increases
Varvara68 [4.7K]

Answer:

for food, water, shelter, mates, light, and other resources needed for survival and reproduction.

Explanation:

hope this helps

so sorry if this is wrong

3 0
2 years ago
MUST BE at least 350 WORDS 50 POINTS
Alona [7]

Answer:

Sickle cell disease (SCD) affects millions of people around the globe and is the 4th leading cause of deaths in children in many developing countries. It causes a number of health problems, such as attacks of pain, anaemia, swelling in the hands and feet, bacterial infections and stroke. Sickle-cell contributes to a low life expectancy in the developed world of 40 to 60 years.  

The disease results in abnormal haemoglobin - the oxygen-carrying protein found in red blood cells – giving the blood cell a rigid, sticky, sickle-like shape that hinders its oxygen-binding properties. These irregularly shaped cells can get stuck in small blood vessels, which can slow or block blood flow and oxygen to parts of the body. A blood and bone marrow transplant is currently the only cure for sickle cell disease, but only a small number of patients are eligible. For the rest, there's no cure but effective treatments can relieve pain, help prevent problems associated with the disease and prolong life.

70 years ago, researchers found a genetic connection to the anatomical abnormalities seen in blood cells. A mutation seemed to be causing the moon-shaped blood cells. The most severe form of the disease occurs when two copies of the mutation are inherited. However, patients with one sickle cell gene, referred to as sickle cell trait, usually do not have any of the signs of the disease and live a normal life, but they can pass the trait on to their children.

As with all inherited genetic diseases, you’d expect natural selection to weed out a gene that has such unpleasant consequences but with sickle cell disease, that doesn’t seem to be the case. Indeed, as of 2015, about 4.4 million people have sickle cell disease, while an additional 43 million have sickle cell trait. So what makes the disease stay in the human population?

Researchers found the answer by looking at where the disease was most prevalent. As it turns out, 80% of sickle cell disease cases occur in Sub-Saharan Africa or amongst populations having their ancestors in this region, as well as in other parts of the world where malaria is or was common. There was a long standing theory that the sickle cell trait – having only one sickle cell gene – didn’t cause discomfort and provided a bonus trait of preventing patients from contracting severe forms of malaria. Later confirmed - associating sickle cell to a 29% reduction in malaria incidence - this working theory would explain why the mutation stuck around in evolution. In 2011, researchers used mice to confirm the assumption.

Miguel Soares and Ana Ferreira of the Gulbenkian Institute of Science in Oeiras, Portugal, and colleagues found that haem – a component of haemoglobin – is present in a free form in the blood of mice with sickle cell trait, but largely absent from normal mice. By injecting haem into the blood of normal mice before infecting them with malaria, researchers found it could help guard against malaria. The mice did not develop the disease. Their results also showed that the gene does not protect against infection by the malaria parasite, but prevents the disease taking hold after the animal has been infected.

Explanation:

Sorry if I did or got anything wrong:(

I actually tried on this tho:)

3 0
2 years ago
What is two different ways to gather dna
Serjik [45]
Honestly you can get DNA by taking a piece of someone or just by them touching something. 

Hope I helped and if you need more you could always ask me :)

-Dawn
7 0
2 years ago
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