Plant cells have a cell wall, but animals cells do not. Cell walls provide support and give shape to plants. Plant cells have chloroplasts, but animal cells do not.
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Answer:
I believe the answer is C
Explanation:
When going to an interview you never want to be too early or late at all. If his car breaks down he might be angry or frustrated. I’ve never met a person who becomes happy when something bad happens. 
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Well, when chromosomes cross over during prophase 1 of meiosis, the homologous pair of chromosomes exchange segments of DNA which happen to be the genes. So the significance of crossing-over during prophase 1 is that it adds genetic variation to sexually reproducing organisms.
        
             
        
        
        
Answer:
Weather conditions
Explanation:
Food can be limited based on location, however, scientists can control what kind of food it is. Soil can be tested and experimented on. There can be a lot of it and different kinds. Space is fought over because of territories and is limited compared to how many people and animals there are. Weather is not something that can be controlled in an experiment since it is sporadic. 
 
        
                    
             
        
        
        
Answer:
An object with a positive charge will be attracted to the positive plate.
Explanation: