Answer: 2. Precipitation
Explanation:
Aerobic cellular respiration requores oxygen. Photosynthesis does, as well.
 
        
                    
             
        
        
        
The evidence supporting the idea that modern birds and reptiles share a common ancestor is that feathers are a derived characteristic that first evolved in reptiles. Feathers represent an evolutionary derived trait.
In evolutionary biology, an autapomorphy is a distinctive phenotypic trait referred to as a derived trait, which is unique to a particular group/taxon.
The derived traits are phenotypic features that arise during the evolution of a particular taxonomic group.
These traits (derived traits) differ from the phenotypic trait of the ancestor of the group.
Learn more in:
brainly.com/question/3406200
 
        
                    
             
        
        
        
Answer:
The correct answer is letter C. Experimentation.
Explanation:
 For a scientist, assessing the validity of information requires experimentation. In statistics and sciences, the validity of an information has no agreed definition but it generally refers to the how the concept is being experimented before reaching to the point of conclusion.
 
        
                    
             
        
        
        
A. can cats learn to sit down on command
        
             
        
        
        
The <span>corpus callosum connects the two hemispheres. 
Hope that helped you!</span>