<u><em>Growing plants in space is tough -- low gravity means water distribution is difficult to manage, the roots are often starved of oxygen, and stagnant air reduces evaporation and increases the leaf temperature</em></u>
 
        
                    
             
        
        
        
The best answer I see is A
please tell me if I´m right
sorry if i am not
 
        
             
        
        
        
A) Mitochondria - because they are double membraned and the inner one is highly folded into 'cristae' 
        
             
        
        
        
Answer:
b) By mixing weak base with its conjugate acid and then adjusting the pH with strong  acid.
Explanation:
Hello,
In this case, considering that the buffer required a pH greater than 7 where the basic conditions are present, we need a weak base and its conjugate base in order to assure such pH greater than 7. Moreover, by using a strong acid, we can gently add it in order to decrease the pH up to 7.4 via a properly measured neutralization of the necessary moles of base up to a hydrogen concentration of 3.98x10⁻⁸ (pH). Therefore, answer is b) By mixing weak base with its conjugate acid and then adjusting the pH with strong  acid.
Best regards.
 
        
             
        
        
        
Answer
Environmental pressures
Basically every animal adapts to pressures from their environment in different ways, causing them to have different shapes and sizes