Hello.
There are a couple things needed for natural selection.
Natural selection is organisms become comfortable and changer where they are newly located. Where they can live and get more off springs. 
First, You will need <u>heredity</u>  which passes traits to an offspring.
Second, <u>reproduction</u> that is needed to to copy traits and give them to the offspring.
 
        
             
        
        
        
Answer:
B
Explanation:
The movement of plates (convergence, divergence etc) cause landforms such as mountains and volcanoes to form! It's really cool, isn't it!
 
        
             
        
        
        
<span><span>a.   </span>Reproducing</span>
f. obtaining
energy
d.
maintaining structure
Why do these
three illustrate the great challenge for every species.
<span><span>
1.   </span>Reproduction, is as vital for an entire race to survive. It prolongs
their generation onwards and offspring to the next centuries to pass by.</span>
<span><span>
2.   </span>Obtaining energy. In both humans and animals, even plants is a
challenge because these creatures need to work in order to obtain these need
resource from food –preys.</span>
<span><span>
3.   </span><span>Maintaining structure. For the living organisms to still exist they
need to keep themselves intact. Combating diseases and having nutrition. This is
a by-product of having energy.  </span></span>
        
             
        
        
        
Answer:
Explanation:
Scientists at the Mauna Loa observatory in Hawaii say that CO2 levels in the atmosphere now stand at 387 parts per million (ppm), up almost 40% since the industrial revolution and the highest for at least the last 650,000 years.