Angiosperms have ovaries; gymnosperms do not.
        
                    
             
        
        
        
20. The answer is 1 (Precambrian)
21. The answer is 4 (Pennsylvanian)
22. The answer is 2 (Bony Fishes, Dinosaurs, and Mammals)
23. The answer is 2 (Reptiles)
        
             
        
        
        
The more biodisverse the ecosystem it is, the more niches are occupied, and the more resilient it is for issues that can occur, the ecosystem can be more stable
        
             
        
        
        
Answer:no
Explanation:
Because you could be blind
 
        
                    
             
        
        
        
Genetic diversity
Explanation:
Sexual reproductions, mutation, and crossing-over generates a wide range of genetic diversity within a population. 
- Sexual reproduction is a type of reproduction in which gametes fuses to produce a fertile and viable offspring. 
- Mutation is the process of altering genetic sequences in population to production new breeds called mutants. 
- Crossing-over is the exchange of chromosomes between two homologous pairs. 
All these processes ensures that a pool of diverse gene exists within a population in order give competitive and adaptability advantage to organisms. 
Learn more: 
Genetic recombination brainly.com/question/12685192
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