<span>The RNA world is the hypothesized format of chemical life that existed prior to our current DNA and RNA world. In the RNA world, RNA molecules formed in the primordial soup and began to evolve by self-replication and mutation. This led to increased complexity, natural selection of "better" RNA and diversification of RNA based life.</span>
        
             
        
        
        
Explanation:
%DV label= 27% 
1 cup of cooked collared greens= aprx 266.60 mg of Calcium
Assuming Clara is... 
- a teen, her required adequate intake (RAI)=  1300 mg/ day
- an adult, her RAI= 1000 mg/day
For teenaged Clara
∵27 % DV= 270mg
% daily Calcium=   = 20.8 ≈ 21%
 = 20.8 ≈ 21%
=0.21 
<u>21% of her daily calcium needs is in a cup of cooked collard greens.</u>
Calcium is an essential mineral required by the human body, it is involved in cell signalling, muscular function and homeostasis. Along with fats, fiber, vitamin A and C and iron, calcium makes up part of a recommended daily intake target or DV- these are integral to a balanced diet. 
Learn more about energy storage at brainly.com/question/523624
Learn more about homeostasis at brainly.com/question/1601808
#LearnWithBrainly
 
        
             
        
        
        
According to Newton's first law, an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Any passengers in the car will also be decelerated to rest if they are strapped to the car by seat belts. Also if a car was going straight but another car (unbalanced force) bumps into it causing the motion of the car to change.
        
             
        
        
        
B. DNA replication is the most similar to PCR
        
             
        
        
        
Answer:
True is the answer but i don't know why