Identify the types of scientific investigations described.: this type of investigation relates two objects., this type of investigation does not have a hypothesis., this type of investigation has a control group., this type of investigation involves observations only., this type of investigation involves a test conducted to gather evidence that supports or refutes a hypothesis.

It is as follows
1. Comparative Investigation.
2. Descriptive Investigation
3. Experimental Investigation.
4. Descriptive Investigation
5. Experimental Investigation

This are the three types of Scientific Investigations. Descriptive investigations are often used to describe an object or a part of it. One example would be using a microscope and describing the specimen. Comparative Investigation deals with two or more set of data and comparing their conditions. Lastly, a Experimental Investigation is a study based on a hypothesis, which can either be prove or disprove using experimentation.

The anwser is: wave a has a greater pitch and frequency.