Bloodstains and hairs are known as what kind of evidence at a crime scene?

D. biological

Why is blood found at a crime scene often allowed to dry before taking a sample?

A.
DNA can only be tested from a dry sample.
B.
It’s too messy.
C.
Wet blood samples can degrade.
D.
It’s faster.

C. Wet blood samples can degrade.

The answer is D. biological. Bloodstains and hairs are considered to be biological evidence at a crime scene. This type of evidence can provide crucial information about the individuals involved in the crime, such as their DNA profile or other biological characteristics. To determine this answer, you could have considered the different types of evidence that are typically found at a crime scene. Bloodstains and hairs are organic materials that are derived from the human body, which makes them fall under the category of biological evidence.