A. It has mass.
Air is matter, and can't be seen thus not all matter can be seen.
Any liquid or gaseous is matter (water, air, etc.)
Since it can be liquid or gaseous it doesn't have to maintain it's shape and size to be matter.
        
             
        
        
        
Answer:
Light energy, Water, and Carbon Dioxide/Chlorophyll
Explanation:
Photosynthesis uses 12 water molecules, 6 Carbin Dioxide molecules and light energy so it can produce one glucose, six water and oxygen molecules. This can be expressed and represented by 12H2O + 6CO2 + light energy = C6H12O6 + 6H2O + 6O2
Vital to remember that the produced oxygen is from the original water molecules and not the carbon dioxide.
 
        
             
        
        
        
Humans get there energy primarily from glucose I believe. We break down glucose to get ATP (Adenosine Triphosphate) which is then used to supply energy to our cells in order to function. 
        
             
        
        
        
Answer:
O weather, climate
Explanation:
A local area's short-term atmospheric conditions are known  as weather while long term conditions are known as  climate.
I hope this helped :)
 
        
             
        
        
        
Looks like the order they appear in is the correct order.
1. Question-wording bias
2. Under-coverage
3. Response bias