Answer:
Step-by-step explanation:
First of all, we need to define biology so as to understand what a biological field may entail. Biology can be defined (loosely) as the study of living things; plants and animals. Hence, a biological field is a field that involves studying plants or animals or even both.
Agricultural science is regarded as a biological field because it involves the studying of cultivating of crops (plants) and rearing of animals for use (in the form of food and fibre) by man. From this, it can be deduced that agricultural science also deals with a study aspect of plants and animals.