In the evolution of extremely large stars, they begin as supergiants or supernovas, if the star nucleus is large enough it will continue to contract and form neutron stars, and finally, if the contractions continue, everything around the neutron star and the neutron star itself will be pulled into what is called a a. white dwarf c. giant b. nebula d. black hole

The answer is d: a black hole. A black hole exhibits such strong gravitational pull that nothing can escape, not even electromagnetic radiation such as light. Black holes are predicted by the theory of general relativity. The boundary of the region from which no escape is possible is called the event horizon. 

Biologists use cladograms and phylogenetic trees to illustrate relationships among organisms and evolutionary relationships for organisms with a shared common ancestor. ... First, a cladogram can look at trees that may have been derived from a common ancestor to arrange organisms on different branches.

Explanation:

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