Answer:
wow hope u feel better sis
A common requirement of a PhD across different schools and countries is: D. a dissertation.
<h3>What is PhD?</h3>
PhD is an acronym for Doctor of Philosophy and it can be defined as the highest level of degree that is awarded to a graduate, especially after the completion of a masters degree (MSc.) in a particular course of study.
As a general rule, a dissertation is a common requirement from all students of a Doctor of Philosophy (PhD) across different schools and countries.
Read more on dissertation here: brainly.com/question/2094985
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B. Postdated Check. I think if not correct sorry
Because Astronomers use light-year instead of kilometers to measure distances in the universe because distances in space are so huge that km would be too large to manage.
