<span>The correct answer is b.0.5 to 1 micrometre thick.</span> 
Usually, the respiratory membrane is about 0.6 micrometres thick. This membrane consists of the alveolar epithelial cells, the capillary endothelial cell, and basement membranes which are formed by the alveolar and capillary cells.
        
             
        
        
        
Answer:
Sheep Brain:
Sheep brain is smaller in size the human brain. The convolutions or folds are absent in sheep brain. Olfacory bulb is more developed in shhep's brain as compared to human brain. Sheep brain is more elongated in shape.
Human brain:
Human brain is large in size. The convolutions are more numerous in human brain. Human's brain olfactory bulb is less developed as compared with sheep's brain. Human brain is round in shape.
 
        
             
        
        
        
Answer:
A chemical element is a type of atom with the same number of protons in their <u>atomic</u> nuclei. 
Explanation:
For an example, the atomic number of Chlorine is 17, and there is 17 protons in Chlorine.
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Answer:
Five involuntary movements are- Beating of heart, Breathing, digestion, eye re-flexion, salivation.  
Explanation:
Involuntary movements can be described as uncontrolled movements of the body parts on which one has no control over. 
 
        
             
        
        
        
Answer:
Ethanol fermentation causes bread dough to rise. Yeast organisms consume sugars in the dough and produce ethanol and carbon dioxide as waste products. The carbon dioxide forms bubbles in the dough, expanding it to a foam. Less than 2% ethanol remains after baking.
Explanation:
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