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4 years ago

11

which of the following is not a characteristic of life? a. maintains homeostasis b. composed of cells c. composed of atoms d. ca

rries out metabolism

1 answer:

Pani-rosa [81]4 years ago

5 0

I believe option C. Composed of atoms is not a characteristic of life.

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Where do scientists obtain adult stem cells?<br> saliva<br> pancreas<br> skin<br> bone marrow

Alex17521 [72]

<span> Embryonic stem cell research is kind of a dead area now since there is no way to control the differentiation. Most research is being done on adult stem cells to help map and control the differentiation process.

Stem-cells from aborted fetuses - The government doesn't sponsor this, if it is done it is by private companies not located in the USA. You could try researching umbilical cord stem cells to be somewhere near your topic. They come from the afterbirth of normal deliveries.

You could do a much easier report by covering cloning of mice through stem-cell technology. It is happening and helping scientists understand diseases. </span>

6 0

3 years ago

If a person develops chronic lymphocytic leukemia, what leukocytes may be involved and how mature are they in the bloodstream? C

Hatshy [7]

Answer:

The correct answer is -

anemia- erythrocytes

easy bleeding- platelets

Repeated infections - leucocytes

enlarged lymph nodes- leucocytes

shortness of breath- erythrocytes

excessive bruising- Platelets

Explanation:

Cancer of the lymphocytes is chronic lymphocytic leukemia (CLL). Lymphocytes are a type of white blood cell involved in the body's immune system.

Platelets are tiny blood cell fragments that help your body form clots to stop bleeding. The platelets then rush to the site of damage and form a plug, or clot, to repair the damage.

Erythrocytes are red blood cells that travel in the blood. They carry oxygen from the lungs to the body and bring carbon dioxide back to the lungs to be expelled.

Leucocytes- White blood cells (also called leukocytes or leucocytes and abbreviated as WBCs) are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.

6 0

3 years ago

Which statement describes the amount of rainfall in grasslands?

Solnce55 [7]

"More than deserts, less than forests" is the one statement among the following choices given in the question that <span>describes the amount of rainfall in grasslands. The correct option among all the options that are given in the question is the fourth option or option "d". I hope the answer has come to your help.</span>

6 0

4 years ago

Humerus bones from the same species of animal have approximately the same length-to-width ratios. It is known that Species A has

Dima020 [189]

Answer:

The unearthed Humerous bones don't belong to the species A.

Explanation:

Hello!

You are studying the Humerus bones species A, who is known to have a mean ratio of 8,5. This value corresponds to the population mean of the length-to-with ratio of bones of species A, symbolized as μ.

The hypothesis you want to study is "The Humorous bones unearthed belong to the species A" if you assume this to be true, then the mean of the length-to-with ratio should be equal to the known population mean of the length-to-with ratio.

Symbolized:

H₀: μ = 8,5

H₁: μ ≠ 8,5

Significance level: α: 0,05

You are asked to use a Z-test, since you don't know the value of the population variance, but have the sample values, the sample size is big enough (more than n=30). Assuming that the sample values are independent, the statistic test of choice is the approximation:

$Z= \frac{x_bar-μ}{S\sqrt[]{n} }$ ≅N(0;1)

The critical region, in this case, it's a two-tailed test (remember the type is determined by the null hypothesis) so you'll have two critical values.

Left value [/tex] $Z_{\alpha/2} = Z_{0,025} = -1,96$

Right value $Z_{1-\alpha/2} = Z_{0,975} = 1,96So you'll reject the null hyphotesis if the calculated [tex]Z_{obs}$ value is ≤-1,96 or ≥1,96 and you'll support it if -1,96< $Z_{obs}$ <1,96

Now we calculate the statistic by replacing the formula with the data:

x_bar = 9,26

S = 1,20

n = 41

$Z_{obs}= \frac{x_bar-μ}{S\sqrt[]{n} }$

$Z_{obs}= \frac{9,26-8,5}{1,20\sqrt[]{41} }$

$Z_{obs}$ = 4,0553

Since the calculated value falls in the rejection region, this means, you have statistically significant results. In other words you can reject the null hipothesis (H₀: μ = 8,5) and asume that the unearthed Humerous bones don't belong to the species A.

I hope you have a SUPER day!

7 0

3 years ago

___________ is a measure of the degree to which the phenotypic variation of a given trait is due to genetic factors.

nataly862011 [7]

The answer should be heritability.

7 0

3 years ago