Answer:
Some parts of the cell theory would change because maybe the original one said something completely  different. so some parts of the cell theory would change like: all cells comes from preexisting cells.And It would changed to something like: All cells form all by them selves.
Explanation:
 
        
                    
             
        
        
        
Answer: from the pulmonary veins into the left atrium.
Explanation:
After oxygenation of blood in the lungs, the right and left pulmonary veins carry oxygenated blood and empties it into the left atrium. The left atrium then empties the blood into the left ventricle through the left atrioventricular valve.
With contraction, the ventricle pumps the blood to the systemic circulation through the aorta. The blood flow into the aorta is guarded by the aortic valve.
 
        
             
        
        
        
Corrosion is when weather weakens and brakes apart rocks. An example would be the rocks at the beach that eventually begin to form holes and loose its mass due to the constant corrosion from the sand, water, and wind.
        
             
        
        
        
Hi there!
Although there are only 20 amino acids, these amino acids can combine into an innumerable amount of combinations to form different and unique proteins. 
<span>In case that doesn't make sense to you, I'll provide you with an analogy. You could be provided with 20 different LEGO bricks to work with. While there may only be 20 bricks, these bricks can combine into a vast amount of different formations, structures, etc. Amino Acids work in the same way.</span>
        
             
        
        
        
Answer: The correct answer is salt.
A compound is a chemical substance which is formed by the combination of two or more elements, joined together in a fixed proportion.
Salt is a chemical compound which is formed by the reaction of an acid with a base. For example- NaCl ( sodium chloride) is a common salt. It is formed by the combination of two elements. Therefore, salt is a compound.
On the contrary, Phosphorous (P), sulfur (S) and Oxygen (O₂) are composed of a single element. Therefore, they are not compounds.
Thus, the correct answer for the compound is Salt
.