What is the approximate minimum stream velocity required to transport the smallest particles of sand?

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field

Which of the following is a true statement? question 8 options: populations can't evolve, only individual organisms. individuals have adaptations that can change over time. individuals have traits that may or may not make them successful at reproduction. individuals evolve to have adaptations.

All of these things can block a bronchus and cause collapse of a lung except