Answer:
Adult cottonmouths are brown.
Explanation:
An observation is a fact that you can clearly see and don't have to guess if it is true or not.
 
        
             
        
        
        
Answer:
Liquid and with a higher osmotic pressure
Explanation:
Remember that a cell that is surrounded by an environment with a higher osmotic pressure, will produce that the cell get some water outside to make some dilution to the salt concentration that surrounds the protozoan. 
 
        
             
        
        
        
Answer:
ACATCGACGCGA
Explanation:
In DNA 
adenine pairs with thymine 
cytosine pairs with guanine 
 
        
             
        
        
        
Answer:
California
Explanation:
The first recognized "smog" fightning occured back in Los Angeles in summer of 1943
 
        
             
        
        
        
Answer:
d.
Explanation:
A chromosome is a strand of DNA that is encoded with genes. In most cells, humans have 22 pairs of these chromosomes plus the two sex chromosomes (XX in females and XY in males) for a total of 46. The word chromosome was originally coined in German from the Greek words khroma, meaning color, and soma meaning body.