Answer:
Composition of thin myofilaments:
                                                     The proteins in thin filaments are actin, tropomyosin, and troponin.
Composition of thick myofilaments:
                                                   Thick filaments are composed of protein myosin only. 
        
             
        
        
        
The issue of sediment in aquatic environments has been a topic of concern for many decades. During the nineteen-thirties, erosion became a national issue because of the dust bowl and as a result the Soil Erosion Service was established. Since the nineteen-thirties, the study of sediment erosion, transport, deposition, and intrusion has increased exponentially in the United States. Considering all of the past and current research, it is difficult to focus on essential research, but with limited resources it is imperative to refine the topics and prioritize the necessary areas of study. The same scoping is also true for treatment practices. The best and most effective treatment should be used on the most critical habitat. Establishing this systematic prioritization is a challenging but substantive endeavor.
 
        
             
        
        
        
a variable is the right answer
 
        
             
        
        
        
Answer:
C. Glucose, a nonpolar molecule, can pass freely across the phospholipid bilayer from high to low concentration is correct answer
 
        
             
        
        
        
The correct answer is a. Complex
A complex or undefined medium is rich in nutrients, which contain water-soluble extracts of plant or animal tissue, a sugar, (often glucose is added to serve as the main carbon and energy source). The combination of extracts and sugar creates a medium which is rich in minerals and organic nutrients, but the exact composition is unknown.