The correct answer is Metal.
Sound waves are vibrations which need medium to propagate. Higher the density of medium, the sound travels fastest. Sound travels fastest in solid than liquid and gas. Therefore, in this question sound will travel faster in metal because metal has higher density than air and water and it will not travel in vacuum as sound needs medium to travel.  
 
        
                    
             
        
        
        
Smoking during pregnancy affects your and your baby's health before, during, and after your baby is born. The nicotine (the addictive substance in cigarettes), carbon monoxide, lead, arsenic, and numerous other poisons you inhale from a cigarette are carried through your bloodstream and go directly to your baby. Smoking while pregnant will:
<span>Lower the amount of oxygen available to you and your growing babyIncrease your baby's heart rate<span>Increase the chances of miscarriage and stillbirth</span>Increase the risk that your baby is born prematurely and/or born with low birth weightIncrease your baby's risk of developing respiratory problems</span>
The more cigarettes you smoke per day, the greater your baby's chances of developing these and other health problems. There is no "safe" level of smoking for your baby's health.
 
        
                    
             
        
        
        
The
statement that best supports that belief is “both have cell wall made
of cellulose, store food material as starch, and have chlorophyll a and chlorophyll
b”.
 
The green algae are a
large, informal grouping of algae consisting of the Chlorophyte and Charophyte
algae, which are now placed in separate Divisions. The land plants or
Embryophytes are thought to have emerged from the Charophytes.
 
The correct answer between all
the choices given is the first choice or letter A. I am hoping that this answer
has satisfied your query and it will be able to help you in your endeavor, and
if you would like, feel free to ask another question.
 
        
             
        
        
        
Answer:
Nitrogen 
Explanation:
 
The nitrogenous bases of the two separate polynucleotide strands are bound together, according to base pairing rules (A with T and C with G), with hydrogen bonds to make double-stranded DNA.
 
        
             
        
        
        
Answer:
light reaction because glucose is a factor of sugar.