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ASHA 777 [7]
3 years ago
11

What is the major function of valves in human veins

Biology
1 answer:
Olenka [21]3 years ago
3 0
To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).         
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Nonkeratinized stratified squamous epithelium can be found lining what area of the respiratory tract? alveoli nasal cavity bronc
mylen [45]

The answer is oropharynx. The reason for this type of epithelium in this region of the respiratory tract is due to its proximity to the esophagus. This means that this region of the respiratory tract is subject to abrasion by food passing down the esophagus. This epithelium is continuous with that of the esophagus.






5 0
4 years ago
Read 2 more answers
placentals and marsupials are two groups of mammals. placentals are more closely related to each other than they are to any othe
NeX [460]

Due to convergent evolution placental mammals (Wolf) are closely related to marsupial wolves (Tasmanian wolf). No, the tree is wrong.

What is convergent evolution?

It is the presence of similar features in animals of different lineages. The structures in these animals have similar functions but are absent in the common ancestors hence they are analogous structures not homologous.

Such convergence of functional, morphological, and structural traits from phylogenetically unrelated species may be a result of random mutation due to selection pressure.

Here, the Tasmanian wolf (marsupial wolf) and wolf (placental mammal) have several morphological similarities but they have unrelated ancestral lineages. Hence they show convergent evolution. These two subclasses of mammals have adapted to a specific food source, locomotor ability, or environment in similar ways.

Hence, the placental wolf and Tasmanian wolf exist sharing the same habitat in different continents former in Asia and the latter in Australia because these two show convergent evolution.

Learn more about convergent evolution from the link given below:

brainly.com/question/2698940?utm_source=android&utm_medium=share&utm_campaign=question

#SPJ4

3 0
1 year ago
I need help with this question plzzz
Dafna11 [192]
I would think it would be C
5 0
3 years ago
2. During photosynthesis, carbon dioxide and (oxygen / sodium chloride / water I
Westkost [7]

Answer:

water for first

sugar for second

oxygen for third

7 0
3 years ago
If a nearsighted person has a far point df that is 3.50m from the eye, what is the focal length f1 of the contact lenses that th
miv72 [106K]

Answer:

-3.50 meter

Explanation:

A nearsighted person uses concave lens.

Given -

Far point i.e distance of object = - 3.5 meter

Distance of image is not given . Hence we will assume that the image can be formed at any distance. We will take "di" = infinity

As we know

\frac{1}{f} = \frac{1}{di} + \frac{1}{df} \\

Substituting the given values in above equation, we get -

\frac{1}{f} = \frac{1}{infinity} + \frac{1}{-3.50}\\ \frac{1}{f} = 0 + \frac{1}{-3.50}\\ f = -3.50

Hence, the focal length of the contact lens is equal to -3.50 meter

6 0
3 years ago
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