Answer:
The condition of the Earth had to become favourable before it could support any form of life. 
The formation of the different layers around the earth like the ozone layer was necessary before life could originate. Primitive species such as some prokaryotes were able to live in hydrothermal conditions during the initial times. With the passage of time, as the concentration of oxygen increased due to photosynthetic prokaryotes, situations became favourable for eukaryotic organisms to arise. 
 
        
             
        
        
        
A dog fulfilled the three points of the cell theory through the healing of the cuts it encountered when playing.
<h3>What is a Cell?</h3>
This is defined as the simplest or basic unit of life and the three points of cell theory include:
- All organisms are made of one or more cells
 
- The cell is the basic unit of all organisms.
 
- All cells come from existing cells.
 
The cut the dog had healed as a result of the formation of the cells from existing cells through mitosis thereby resulting in the healing.
Read more about Cell theory here brainly.com/question/1594446
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Definition of espionage: the practice of spying or of using spies, typically to obtain political or military information.
        
                    
             
        
        
        
Answer & Explanation:
- One of the biggest differences between these two groups of monkeys is their tails. On one hand, some species of New World monkeys possess prehensile tails, meaning they can use their tails to grasp or hold on to objects. Their tails can aid these monkeys in finding and eating food in the canopy as well as moving amongst the trees, as their tails provide extra support and balance. 
- On the other hand, Old World monkeys all have tails, but they lack the ability to grasp objects. However, some Old World monkeys have pads called ischial callosities surrounding their hind region. As these monkeys tend to spend more time on the ground than their arboreal New World counterparts, these calloused areas of skin provide support when they sit to feed or rest. 
I hope this helped! :)