Humans ferment lactic acid in muscles where oxygen becomes depleted, which is why sometimes if you finish a run and don't stretch soon you have have discomfort. <span />
        
                    
             
        
        
        
Answer:the planets are moving sideways.
Explanation:
 
        
             
        
        
        
Answer:
This question lacks options, the options are:
A. Halved
B. Doubled (x2)
C. Quadrupled (x4)
D. Octupled (x8)
The answer is B. 
Explanation:
Via the process of meiosis, gametes are formed in order for sexual reproduction to occur. However, the chromosomal content of the gametes are reduced by half. According to this question, a germ cell is said to have 2 sets of chromosomes i.e. diploid, meaning that each daughter cell after meiosis will have one set of chromosome (haploid, n).
However, before any form of division can occur, the DNA (genetic material) of the cell must be replicated i.e. doubled in order to ensure that each resulting gamete has enough chromosomes. This is applicable in this question as well as the DNA in the germ cell must be DOUBLED (×2) via replication in order to have enough DNA for each gamete. 
 
        
             
        
        
        
These components include; 
Cardiorespiratory Endurance: Ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity. 
Guidelines
3 - 5 days per week
20-60 minutes a day
intensity of 60%-90% of MHR
Muscular strength; the ability to perform activities that require high levels of muscular force. 
2 -3 days per week
2-6 sets
≤ 6 repetitions 
Intensity of 80 - 90 % of 1RM
Muscular endurance; 
2 - 3 days per week 
2 - 3 sets
≥ 12 repetitions
Intensity of 60% - 70% of 1RM
Flexibility 
2- 3 days a week
≥ 4 repetitions per muscle group 
15 - 60 seconds
Body composition     Women   men
Essential fat               10-13%   2-5 %
Athletes                     14-20%  6-13 %
Fitness                      21-24%  14-17 %
Average                    25-31%    18-24%
Obese                      ≥ 32%       ≥ 25%