Overproduction of offspring, inherited variation, and the struggle to survive. 
So: b, d, and e
        
             
        
        
        
Answer:
Look below
Explanation:
 A region must meet two strict criteria: must have at least 1,500 vascular plants as endemics, and it must have a high percentage of plant life found nowhere else on the planet. A hotspot is irreriplaceable
 
        
             
        
        
        
Answer:
The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction
Explanation:
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The human male and female reproductive cycles are controlled by the interaction of hormones from the hypothalamus and anterior pituitary with hormones from reproductive tissues and organs.
        
             
        
        
        
Natural selection occur to give the best survival chance to the organisms. Hence, they bring about biological evolution through future generations thereby increasing the variety of living things. This survival reflects on their ability to produce more offspring. The offspring must continue to survive by competing with the resources found in nature.