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A floodplain (or floodplain) is a generally flat area of land next to a river or stream. It stretches from the banks of the river to the outer edges of the valley. A floodplain consists of two parts. The first is the main channel of the river itself, called the floodway.
 
        
             
        
        
        
Answer:
First generation
Second generation
Third generation
Fourth generation
Fifth generation
Explanation:
First generation: the first generation is "vacuum tubes"
Second generation: the second generation is transistors
Third generation: the third generation is Integrated circuit
Fourth generation: the fourth generation is micro processor
Fifth generation: the fifth generation is artificial intelligence.
 
        
             
        
        
        
Answer:
This term was created by Charles Darwin based off his research on evolution
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
 
        
             
        
        
        
<span>d. All of the above
These behaviors;
Spreading wings
Flattening feathers
panting
are all evolutionary process to maintain body temperature. Birds are warm-blooded animals. Also known as </span><span>homeotherms, which is defined as having the constant body temperature. This is a vital function for the survival of the specie.
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<span>c. are hollow
</span>
The bones of most birds are hollow in order for the weight of the birds to be light for them to fly.