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.
Answer:
both A and B
Explanation:
Together, the number of protons and the number of neutrons determine an element's mass number.
The answer is A. More abundant marine species
Upwelling will cause the movement of nutrient-rich water to the ocean surface. This will makes the water to have more nutrient, so there will be more photosynthesis happens. Photosynthesis will produce more food, so the amount of marine species that could survive would be higher.
Junior College
Junior college is a 2-year institution. This is where you go to get a 2- year associate degree.
