Which structure is the arrow pointing to?

Mario was conducting research regarding the treatment of aids victims using stem cells. he found a source that was written recently and the author was known. unfortunately, he could not determine if it had been peer reviewed.

When creating a plan for the use of space in an early childhood educational setting, it is best to plan for clear passageways throughout the classroom. design only small, cozy spaces so that children feel safe. keep check-in and check-out areas outside the room. thoroughly conceal the toilet and hand-washing area for privacy.

True or false. repeated drug use may lead to drug tolerance which occurs when a user requires larger amounts of the drug to achieve the desired effect.