One of the possible effects of increased carbon dioxide concentration on our planet would be a warmer climate.
<h3>Greenhouse effect</h3>
Carbon dioxide is one of the numerous greenhouse gases that exist in nature. The gases are responsible for the warming of the planet.
Carbon dioxide and other greenhouse gases form a blanket layer in the atmosphere and trap some of the reflected solar radiations from the sun, preventing them from escaping back to space.
The more the concentration of greenhouse gases in the atmosphere, the more the solar radiation that is trapped and the warmer the earth gets. 
More on greenhouse effects can be found here: brainly.com/question/13706708
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Explanation:
NUTRITION AND AGE FACTOR!
 
        
             
        
        
        
Answer:
The rift valley formed when the crust pulled apart.
Explanation:
The statement that best describes how the Great Rift Valley in Africa formed is that they formed when the crust pulled apart. 
- This is geologically known as divergence. 
- The Arabian plate and the Nubian/Somali plate are divergent plates. 
- They are currently moving apart and away from each other. 
- This creates a crack on the earth which is what formed the rift valley in Africa. 
- Along such margins, earthquake activities are prominent. 
 
        
                    
             
        
        
        
Crustacea(ns) form a very large group of arthropods.