Biometric access control systems provide a high level of security by using unique physical characteristics of individuals, such as fingerprints, retinal scans, or facial recognition, to verify a person's identity. This is more secure than using key cards alone, since key cards can be lost, stolen, or duplicated, while biometric traits are much harder to replicate or share. A combination lock, while providing a layer of security, does not uniquely identify an individual and could be more easily compromised through observing the entry or sharing the code. Surveillance cameras act as a deterrent and a means to record events, but they do not actively restrict access to authorized personnel.