Why is cartilage important?

a. it contains a fluid that enables the surfaces of bones to slide over each other smoothly at the joints.
b. it causes bones to fuse together as they grow.
c. it acts as a cushion between bones and protects them as they move against each other.
d. it holds bones together at the joints.

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals