Answer:
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Explanation:
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Answer:
. The explanation given by a theory is well tested and supported by many observations and hypotheses.
Explanation:
A theory is a scientific explanation for a given phenomenon. The explanation provided by a theory are usually derived from a well tested hypothesis and experiment.
A hypothesis is a scientific guess of phenomenon. It is upon the hypothesis that most experiments are predicated.
Before a theory is developed from a hypotheses, it must be well tested and proven to be true.
The true statements about wildfires is that they can spread all over the forests
Answer:
The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
Alveoli are tiny sacs which form the site of gas exchange in the lungs.
The features of alveoli which help in gas exchange are:
- They increase the surface area in the lungs thus, more space is available for gas exchange.
- They have very thin walls, as thin as the thickness of a single cell only.
- They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.