The answer is c because they are categorized as they come in order
        
             
        
        
        
Answer:
<h3>Maintenance of ionic balance.</h3>
Explanation:
Synovial fluid is a viscous fluid found in the cavity of synovial joints. In terms of appearance the synovial fluid appears  clear
, Colorless (pale yellow)
, viscous, microbes free.
Synovial fluid has following functions in our body 
a) shock absorption
b) nutrient distribution
c)  lubrication of the articular surfaces
d) waste disposal
 
        
             
        
        
        
The first one is epidermis, the second one is the dermis i believe, I hope this helps
        
             
        
        
        
Answer:
Species diversity is concerned with both commonalities and  differences. This is seen in the variety of species from mammals to insects. This shows the classifications of the species in the environment in order for them to survive and adopt to the changes and climate.
Explanation:
 
        
             
        
        
        
Answer: b: kilometers 
Explanation: meters are some what small. centimeters are small. millimeters are small. the biggest measurement here are kilometers