Question

uses biotechnology to analyze hair to identify criminals.

If you are using equipment to make fruits and vegetables larger, you are in the
field of biotechnology.

A person who wants to study genetics might use
biotechnology.

Answer 1

All three are reasonable examples of biotechnology — but with small clarifications:

- "Uses biotechnology to analyze hair to identify criminals."
Yes. Forensic biotechnology (DNA profiling) analyzes DNA from hair, blood, or other tissue using techniques such as PCR, STR analysis and DNA sequencing to match suspects or victims.

- "If you are using equipment to make fruits and vegetables larger, you are in the field of biotechnology."
Partly true. Increasing crop size or yield is an agricultural/plant‑biotech goal, but simply using ordinary equipment (bigger tractors, fertilizers) is agronomy/agritech rather than biotechnology. Biotechnology methods that increase size or yield include selective breeding, tissue culture, transgenic modification, and gene editing (e.g., CRISPR).

- "A person who wants to study genetics might use biotechnology."
Yes. Geneticists routinely use biotech tools — PCR, gel electrophoresis, DNA/RNA sequencing, microarrays, CRISPR — to study genes, gene expression, and heredity.

Brief definition: biotechnology is the use of living organisms, cells, or biological processes to develop products or technologies (medical, agricultural, industrial, forensic, environmental, etc.).