Unlike exocrine glands, endocrine glands <span>release secretions directly into the blood. The correct option among all the options that are given in the question is the third option or option "C". Basically exo means outside and endo means inside. This is the hint that will lead to the correct answer.</span>
        
             
        
        
        
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Answer:
2. A change occurs in the environment.
4. Poorly adapted individuals have decreased survivorship.
1. Well-adapted individuals leave more offspring than do poorly adapted individuals.
3. Genetic frequencies within the population change.
Explanation:
The natural selection theory was developed by Darwin to explain how evolution occur within a population. The environment is in constant state of changes and always select for organisms that are better adapted to it.
Poorly adapted organisms gradually reduce from the population as a result of decreased survival while well-adapted individuals multiply and contribute more to successive generation. 
Well-adapted individuals pass on the adaptive alleles to their offspring, eventually leading to a change in gene frequencies within the population.
Hence, the sequence of events is 2, 4, 1 and 3.
 
        
             
        
        
        
Answer: Human space exploration helps to discuss questions about our place in the Universe and the history of our solar system. Through addressing the challenges related to human space exploration we expand technology, create new industry, and help to foster a peaceful pro with other nations. 
 
        
             
        
        
        
The biosphere is the worldwide sum of all ecosystems. Biodiversity is the variation of genetic species in the ecosystem. 
hope this helped :)