How does natural selection lead to evolution?
a. adapted traits cannot be passed to offspring.
b. every generation is a new species.
c. an organism always has the same traits as its parent.
d. many small changes can create a whole new species.
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Answer:

Option d. many small changes can create a whole new species

Explanation:

In the natural selection when the animals gets adapted in a better manner, they tends to thrive in and gets the ability to reproduce more which leads to the formation of the new bigger species. It leads to a change when the individual with few characteristic have the survival chance more also the reproductive rate as compared to others individuals in the group and also passes these inheritable genetic traits to the offspring.  

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.