<u>Here Is You Awnser's Hope It Helped :)</u>
<u />
19 = Wave Length
20 = Compression
21 = Rare Fraction
22 = Displacement 
23 = Crest 
24 = Wave Length 
25 = Trough
 
        
             
        
        
        
Answer:
"Be freezing at night because the planet has no atmosphere" is the correct answer.
Explanation:
I was doing my reading in OW and I quote this is what OW said:
Temperatures during the day can reach 430°C (800°F), but can drop to -170°C (-280°F) at night because there is no atmosphere to trap heat.
Hope I helped:)
Have a great day!!!
 
        
             
        
        
        
Answer:
The CORRECT answer is A) Medicine can be produced in mass quantities.
Explanation:
Right on edge :)
**please mark brainliest!!
 
        
                    
             
        
        
        
The correct answer is postural muscles.
Postural muscles are muscles with the function to sustain posture in the gravity field. In response to stimuli such as over-use, under-use or trauma, postural muscles tend to shorten. This type of muscles is sometimes called  tonic muscles because they have high resting tonus.
 
        
             
        
        
        
-Surface area to volume ratio. (surface area / volume)
-Nucleo-cytoplasmic ratio.
-Fragility of cell membrane.
-Mechanical structures necessary to hold the cell together (and the contents of the cell in place)