Answer: Descriptive, Comparative and Experimental (which comes from experimentation).
Explanation:
There are three types of scientific investigations:
- Descriptive: This type of scientific investigation studies parts of a system, which can be natural or artificial. <u>It describes everything that is being studied and no predictions are made</u>. There are three types of descriptive methods: case-study methods (an in-depth study is produced from many sources with different methods), observational methods (no questions asked, just an observation of the behavior of a subject and no manipulation of the variables), and survey method (some people are interviewed and the researchers study the answers.)
- Comparative: <u>It gathers information from organisms, systems, places or from any source, to compare them</u> using also a control group. But, there is no imposed treatment because it is not ethical or because it is not possible. So, the treatment is only observed.
- Experiment: As its names says, <u>it uses an experimental test designed to study some phenomena, where variables are controlled</u> so the treatment is not only observed as the comparative method. Then those variables are measured to collect information or evidence that supports or not a previous hypothesis and is used to assess theoretical knowledge. The independent variable is manipulated while the dependent variable is measured. This type of scientific investigation comes from experimentation.
We need information about what Mendel did. We have no way of knowing what he did without the information you were given and did not include here.
Hey there!
Let's start with the first blank. The ozone layer starts in the stratosphere and is made of ozone gases made to protect the Earth from the Sun's harmful UV rays. If the ozone layer wasn't there (not to mention the rest of the atmosphere), we would be exposed to that kind of radiation. Thereofe, "Ultra violet rys would not be <u>blocked</u> by the ozone layer."
For the next one, a lot of levels of substances in the air would change, like UV and oxygen- as there would be more radiation from the lack of protection and all the oxygen would escape.
Hopefully this helps!