Which organelle can be compared to a security guard who decides whom may enter s building snd whom may not

Cell membrane

Cell membrane

Explanation:

so the membrane blocks some cells and other items from geting into the worng place

electronic measurement tools display data on a screen after waiting for several minutes.

while some business owners prefer manual record keeping systems, most businesses use an electronic record keeping system - making it easier to capture information, generate reports and meet tax and legal reporting requirements.

explanation:

they deliver oxygen to the blood