Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: The bottom two chambers of the heart are called the left and right ventricles. The ventricles receive blood from the atria and pump it out of the heart, either to the lungs or to the rest of the body. Answer: ventricles
[EX A]: What structures receive blood from the atria and pump it out of the heart?

[EX Q]: Passage: Figure 7.22 Osteoporosis Osteoporosis is an age-related disorder that causes the gradual loss of bone density and strength. When the thoracic vertebrae are affected, there can be a gradual collapse of the vertebrae. This results in kyphosis, an excessive curvature of the thoracic region. Answer: osteoporosis
[EX A]: What is the age-related disorder that causes the gradual loss of bone density and strength?

[EX Q]: Passage: Still other pathogens are spread by vectors. A vector is an organism that carries pathogens from one person or animal to another. Most vectors are insects such as ticks or mosquitoes. They pick up pathogens when they bite an infected animal and then transmit the pathogens to the next animal they bite. Ticks spread the bacteria that cause Lyme disease. Mosquitoes spread the protozoa that cause malaria. Answer: vector
[EX A]:
An organism that carries pathogens from one individual to another is called what?