Down syndrome is the result of an extra chromosome 21. Which type of mutation is down syndrome

Aperson travels 35 km in 0.4hrs, followed by 53 km in 0.6 hr. what is the average speed

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Donde se encuentra el adn nuclear en un organismo eucariota?