Answer:
 Yes!
Explanation:
It is stated in the Unified Cell Theory by a Botanist named Schleiden and a Zoologist named Schwann that all Living Things (organisms) are composed of 1 or more cells. The cell is the basic unit of life.
 
        
                    
             
        
        
        
Answer:   A
Explanation:
Carrying Capacity because it is showing how many ferns the rainforest can support.
 
        
             
        
        
        
Answer: Graphs are diagrammatic representation of relationships.
Explanation: Have a great day!!!! Hope this helps.
 
        
                    
             
        
        
        
Answer:
The correct answer is "Renin".
Explanation:
The secretion of the enzyme renin by the kidney is one mechanism used by the kidneys for blood pressure regulation. The secretion of renin is the first step leading to angiotensin II production, in what is known as the renin–angiotensin system (RAS). Renin catalyzes the conversion of  angiotensinogen to angiotensin I, which is subsequently converted to angiotensin II by the angiotensin-converting enzyme (ACE).
 
        
             
        
        
        
You're correct because when birds hit their max altitude it's harder to breathe and to minimize the time of there flight they store immense amounts of oxygen in their lungs.