Which organelle can be compared to a security guard who decides whom may enter a building and whom may not? A) cell membrane
B) cytoplasm
C) endoplasmic reticulum
D) mitochondrion

Drag the tiles to the correct boxes to complete the pairs. match each activity with the type of action used to carry it out. bicycling on the road beating of the heart jumping when startled by a loud horn blinking your eyes every few seconds reflexive action controlled by the brain arrow right involuntary but non-reflexive action arrow right reflexive action arrow right voluntary action arrow right