Why does an injured area hurt? a) increase temperature in the area stimulates pain receptors
b) histamine stimulate pain receptors
c) swelling in the area stimulates pain receptors​

Which two levels of the spine that can undergo flexion and extension?

Which of the following defines scoliosis? a. a posture disorder characterized by the shoulders being rounded and the back hunched b. a posture disorder in which the spine curves up the back like a snake c. a posture disorder characterized by excessive curvature or arch in the lower back d. none of the above

Which organisms are consumers in an ecosystem? choose all answers that are correct. 1 grass 2 bacteria 3 lion 4 wolf