Final Answer:
This indicates the presence of the liquid component of blood (plasma) and white blood cells, while red blood cells are not present. The answer is c) Present: Plasma and white blood cells; Absent: Red blood cells.
Step-by-step explanation:
In a crime scene sample, the presence of plasma and white blood cells is indicated. Plasma is the liquid component of blood that contains water, electrolytes, proteins, hormones, and waste products. White blood cells, also known as leukocytes, are a crucial part of the immune system, providing defense against infections.
The absence of red blood cells in the given options suggests that erythrocytes are not present in the crime scene sample. Red blood cells are responsible for oxygen transport and give blood its red color. Their absence may be relevant in forensic analysis, as it could indicate that the sample is not from a vascular injury or does not contain significant amounts of blood.
Platelets, responsible for blood clotting, are not mentioned as either present or absent in the provided options.