I think this is an theory changing because a new scientific method was developed. They used what Mendel had learned to test the hypothesis themselves and discovered that he was right.
If you didn't know already, trisomy 21 is also known as Down Syndrome. It is caused by error in the cell division which is called nondisjunction. It leaves a sperm or egg cell with an extra copy of chromosome 21 before or after conception.
I believe the answer would be d
Does you question have the following choices?
A) The density of the pebbles and sand would decrease.
B) The rock would become a plutonic rock composed mostly of quartz.
C) The rock would become more felsic with a higher concentration of magnesium.
D) The pebbles would become distorted and the sand would be recrystallized.
If so, then the answer is letter D.
> The change that would most likely to occur if this rock became buried deep within Earth’s crust and was subjected to intense heat and pressure, but did not melt is: The pebbles would become distorted and the sand would be recrystallized.
Zygote is the answer to the question I think I am not sure
