It allows Nutrients and waste substances to pass through them
Answer:
A unit of measurement of atmospheric pressure equal to one millibar. It is named after the French mathematician Blaise Pascal. A hectopascal is equal to 100 pascals and 14.503 × 10−5 (0.00014503) psi. Some altimeter Kollsman window settings are indicated in hectopascals, as well as in inches and millimeters.
Explanation: Hope this helps:)
Spermicide has a failure rate of 28 percent
3.5 million people and about 40% are not
treated
I would say, A. Endoscopy because, it is a tube that goes down the throat or the other way and looks through the digestive tract and the throat cavity.
