Answer:
D
Explanation:
When a substance moves from low to high concentration it is moving against its concentration gradient, which requires more energy. 
A. It depends on where it is moving, not the substance
OB. This is describing diffusion
OC. Does not require energy, it is passive transport through a semi-permeable membrane
 
        
             
        
        
        
Cellular respiration is the process by which many organisms, including plants, produce ATP. During this process, A.Glucose reacts with B.Oxygen, producing C. Carbon dioxide, D. Water, and ATP.
        
             
        
        
        
Answer: 0.18
Explanation:
For the alleles, the percentage distribution of each is 'A' (90% = 0.9)
While 'a' (10% = 0.1)
Hence, 0.9 and 0.1 are the respective frequencies of each allele
Now, apply Hardy-Weinberg Equilibrium equation, where heterozygotes are represented by the 2pq term.
 Therefore, the number of heterozygous individuals (Aa) is equal to 2pq which equals 
2 × 0.9 × 0.1 = 0.18 
Thus, the frequency of heterozygote is 0.18, while the percentage distribution in the population is 18% 
 
        
             
        
        
        
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