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leonid [27]
3 years ago
7

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.

Biology
2 answers:
Ghella [55]3 years ago
5 0
<span>The following statements explain how oxygen was introduced into the earliest atmosphere of the Earth and how the presence of oxygen affected life on Earth.
</span><span>
B) Oxygen is needed to carry out many life processes. The addition of oxygen to the earth's atmosphere assisted with the development of eukaryotic organisms.
</span>
D) Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of photosynthesis.
Travka [436]3 years ago
4 0
The correct answers are:
 B) Oxygen is needed to carry out many life processes. The addition of oxygen to the earth's atmosphere assisted with the development of eukaryotic organisms.
<span>D) Photosynthesis was carried out as cyanobacteria evolved. Oxygen is a product of photosynthesis.</span>
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Is the following statement true or false? the most frequent sign and symptom of a developing pulmonary embolus is tachypnea and
Rainbow [258]

The statement is True.

Dyspnea has a multi-factorial origin, resulting from bronchospasm or vasospasm, disturbances in pulmonary circulation, immobility or diminished respiratory excursion of the diaphragm, atelectasia and/or pulmonary infarction, anoxia, or impairment of cardiac function.

Dyspnea, chest pain, and cough are the most frequent symptoms of Pulmonary Embolism(PE), while fever, tachycardia, abnormal pulmonary signs, and peripheral vascular collapse are the most common physical findings.

Pulmonary embolism (PE) occurs when a blood clot gets stuck in an artery in the lung, blocking blood flow to part of the lung. Blood clots most often start in the legs and travel up through the right side of the heart and into the lungs. This is called deep vein thrombosis (DVT).

Clot in the lung circulation (pulmonary embolus): Breathlessness is usually sudden and associated with rapid breathing and may be accompanied by chest pain.

To learn more about Pulmonary Embolism(PE) here

brainly.com/question/4541755

#SPJ4

6 0
2 years ago
It is raining in Little Rock, Arkansas, in the morning. Which state will probably experience rain by the afternoon?
Harrizon [31]
Little Rock is right in the middle of the state so to figure out where the storm will go next you need the direction of the wind

4 0
3 years ago
DV
Georgia [21]

That question, this incomplete. The full question is:

3. Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. The heights of the trees are measured once a week. What are the dependent variables, independent and the controlled variable of this experiment?

Answer:

  • Independent variable: different humidity levels
  • Dependent variable: the heights of the trees
  • controlled variable: the types of trees

Explanation:

An independent variable is one that exerts an influence within the experiment and can be measured, acting on other elements to promote the observation of a result. As the experiment seeks to observe the influence of humidity on the height of the tree, we can say that humidity is the independent variable.

Dependent variable is that which is influenced by the independent variable to generate a result that can be observed, can also be measured. As the experiment wishes to analyze how the height of the trees was affected by the level of humidity, we can say that the height of the trees is the dependent variable.

Controlled variable is that which is present in the experiment in a constant and equal way, cannot be measured. This variable is the type of trees.

4 0
3 years ago
50N of force is applied to a kg box. What will the acceleration be
Cloud [144]
<h2>ANSWER:</h2>

\huge\boxed{50\frac{m}{s^-2}}

<h2>_____________________________________</h2>

DATA:

Force = 50N

Mass of the Body = 1kg

Acceleration = ?

<h2>_____________________________________</h2><h3>SOLUTION:</h3>

By the second law of newton,

                            F = ma

Rearrange the equation,

                             a = \frac{F}{m}

Substitute the variables in the equation,

                             a = \frac{50}{1}

OR,

                              a = 50 m/s^2

<h2>_____________________________________</h2>

Best Regards,

'Borz'

<h3 />
3 0
3 years ago
Who challenged the idea that insects appeared spontaneously in decomposing meat?
ladessa [460]
Francesco Redi was the first scientist to disprove and challenge the spontaneous generation theory. He experimented on how flies distributed their eggs on the meat which caused flies to arose. Thank you for your question. Please don't hesitate to ask in Brainly your queries. 
3 0
3 years ago
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