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Alina [70]
3 years ago
7

Alveoli are sac-like structures that serve as the site of gas exchange. a. True b. False

Biology
1 answer:
RUDIKE [14]3 years ago
8 0

Answer:

True.

Explanation:

Alveoli are the microscopic structure present deep inside the lungs. Alveoli acts as a basic unit of ventilation. Alveoli are present in the lungs of mammals only.

Alveoli are hollow sac like structures when viewed under the microscope. Alveoli are the main site of the gas exchanges in the mammals. The alveoli are covered by the epithelial layers.

Thus, the correct answer is option (a).

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Which type of cell best complete the concept map
solong [7]

Answer:

Eukaryotic plant cell

Explanation:

Eukaryotic cells have a defined nucleus, unlike prokaryotic cells. Plant cells also have chloroplasts, unlike animal cells and prokaryotic cells, because prokaryotic cells do not contain any membrane-bound organelles (e.g. nucleus, chloroplasts, mitochondria etc.)

6 0
2 years ago
Select ALL the correct answers.
tekilochka [14]

Answer:

(b) The interquartile range of B is greater than the interquartile range of A.

(d) The median of A is the same as the median of B.

Explanation:

Given

A = \{1, 4, 2, 2, 3, 1, 1, 2, 1\}

10th\ run = 9

So:

B = \{1, 4, 2, 2, 3, 1, 1, 2, 1,9\}

Required

Select all true statements

(a) & (d) Median Comparisons

A = \{1, 4, 2, 2, 3, 1, 1, 2, 1\}                         B = \{1, 4, 2, 2, 3, 1, 1, 2, 1,9\}

n = 9                                                         n = 10

Arrange the data:

A = \{1, 1, 1, 1, 2, 2,  2,3, 4\}               B = \{1,1,1,1,2,2,2,3,4,9\}

                               Median = \frac{n + 1}{2}th

Median = \frac{9 + 1}{2}th                            Median = \frac{10 + 1}{2}th

Median = \frac{10}{2}th                              Median = \frac{11}{2}th

Median = 5th                                 Median = 5.5}th --- average of 5th and 6th

Median = 2                                    Median = \frac{2+2}{2} = 2

Option (d) is correct because both have a median of: 2

(b) & (c) Interquartile Range Comparisons

A = \{1, 1, 1, 1, 2, 2,  2,3, 4\}               B = \{1,1,1,1,2,2,2,3,4,9\}

n = 9                                                         n = 10

First, calculate the lower quartile (Q1)

Q_1 = \frac{n + 1}{4}th[Odd n]             Q_1 = \frac{n}{4}th [Even n]

Q_1 = \frac{9 + 1}{4}th                            Q_1 = \frac{10}{4}th

Q_1 = \frac{10}{4}th                              Q_1 = 2.5

Q_1 = 2.5th                              

This means that:

Q_1 = 2nd + 0.5(3rd - 2nd)              Q_1 = 2nd + 0.5(3rd - 2nd)

Q_1 = 1 + 0.5(1- 1)                   Q_1 = 1+ 0.5(1 - 1)                      

Q_1 = 1                                       Q_1 = 1

Next, calculate the upper quartile (Q3)

Q_3 = \frac{3}{4}(n + 1)th [Odd n]             Q_3 = \frac{3}{4}(n)th [Even n]

Q_3 = \frac{3}{4}(9 + 1)th                            Q_3 = \frac{30}{4}th

Q_3 = \frac{30}{4}th                                     Q_3 = 7.5th  

Q_3 = 7.5th                                    

This means that:

Q_3 = 7th + 0.5(8th- 7th)           Q_3 = 7th + 0.5(8th- 7th)

Q_3 = 2 + 0.5(3- 2)                       Q_3 = 2+ 0.5(4 - 2)                      

Q_3 = 2.5                                       Q_3 = 3

The interquartile range is  IQR = Q_3 - Q_1

So, we have:

IQR = 2.5 - 1                  IQR = 3 - 1

IQR = 1.5                       IQR  =2

(b) is true because B has a greater IQR than A

(e) This is false because some spread measures (which include quartiles and the interquartile range) changed when the 10th data is included.

The upper quartile and the interquartile range of A and B are not equal

8 0
3 years ago
what sort of environment (hypertonic, isotonic, hypotonic) does consuming excessive amounts of pure water create in the body flu
Illusion [34]
Hypertonic, the extra water causes the cells to swell.
6 0
3 years ago
Which describes the notation Tt for being the trait of being tall
Lelechka [254]
The answer would be, Heterozygous Genotype.





Hope that helps!!!!
8 0
3 years ago
Which is a density-independent factor?
Bogdan [553]
It’s D , hurricane .
4 0
3 years ago
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