Mostly fish or aquatic animals can breath though there skin and or gills.
Hope it helped :)
Answer:
Those options that apply include:
This is best described as an observational study.
The response variable is the score on the computer-based intelligence test.
and finally,
The explanatory variable is the number of hours exercised during the week.
Explanation:
This is an observational study because the researcher does not have control over the variable.
The response variable is otherwise known as the Dependent Variable for the study.
The explanatory variable is also known as the independent variable.
teens can model good physical fitness to other teens in the neighborhood by asking them to join on a run, make them do push ups, or making them follow you around while you hold their phone in the air. (i did the last one to my little brother. he lost 20 pounds doing that lol)
