I think it is Phytoplankton.
Answer:
Residents of Washington D.C. are banned from voting for president. True
Answer:
Following options are both quantitative and continuous.
1. The amount of tar in a cigarette, measured in milligrams (mg).
3. The time it takes in minutes for a student to walk from the parking lot to their classroom.
Explanation:
Quantitative variables are the numerical variables which can be measured. For example, population of a city.
Continuous variables are also numeric but it have any number of values between its minimum and maximum value. Like in statistics we have age, height, color of eye etc as continuous variables.
In the given options, Option 1, amount of tar cigarette, is both quantitative and continuous as it have numeric value between any two values.
3. Time is measured and can range between any two values (to walk from parking area to classroom) so it is both quantitative and continuous.
If I had written your question in English, I could have helped you
If the manipulation of the independent variable causes a change in the dependent variable, covariance is established.