Question

there are three general types of investigation. each has its own set of benefits and limitations. experimental investigations test a hypothesis. they are usually conducted in, require test, outcome, and controlled variables, and maintain and precision to be considered valid. however, they are not always typical of real - life situations and can be costly. descriptive investigations involve observing a subject or group in a. there are no variables and they occur in real - time. however, this means that these investigations are difficult to replicate, and the observer has over the subject. comparative investigations involve comparing a single property of two or more things that do not affect each other. two groups are observed separately in different conditions and the data is compared. these investigations can be unreliable since controlled variables are not required. this means the researcher has over the subjects or groups. natural environment limited control no control 3d model unnatural environments computer models controlled environments complete control

Explanation:

Experimental investigations are usually done in controlled environments to manage variables. Descriptive investigations observe in natural environments. In descriptive investigations, the observer has limited control as there are no manipulated variables. In comparative investigations without controlled - variables, the researcher has no control over the subjects or groups.

Answer:

1. controlled environments
2. natural environment
3. limited control
4. no control