Which ion causes neurotransmitter vesicles to fuse with the axon's membrane during the conduction of a nerve impulse from one neuron to the next?

You are looking at a structure in the respiratory tract that is filled with small sacs or air pockets. What structure are you looking at?

What structures allow the kidneys to remove cellular waste from blood?

What do sphincter muscles do? a. Trigger hormone release. b. Control peristalsis. c. Secrete digestive juices into the GI tract. d. Mix food with saliva. e. Regulate the flow of food particles along the GI tract.

Charles darwin is best know for developing his theory of evolution based on his observation of what characteristic? a. the beaks of finches b. the scales of snakes c. the necks of giraffes d. the trunks of elephants

Which of these would be the easiest to accelerate? A. a pencil B. a large book C. a refrigerator D. a school bus

Which is the most suitable purpose for using a globe? A. finding the Mississippi River B. seeing a town in North Dakota C. searching for the best route from New York to Los Angeles D. seeing the whole earth

The oldest forensic laboratory in the US was built by whom? Los Angeles Police Department Boston Police Department New York City Police Department Chicago Police Department

Which could be a reason viruses are considered nonliving things? Viruses come from cells. Viruses produce cells. Viruses are made of DNA and proteins, but not cells. Viruses attack cells and are dangerous to them.

How do humans become murderers? What are some of the reasons that cause it?

Relate sexual reproduction to evolutionary forces