Which kind of investigations allow for the control of variables?

hypothesis
experimental
descriptive
comparative

Which material is commonly used as a culture medium for living cells

Aremote community desperately needs more electrical energy. it is located in an area with the following characteristics: average wind speed of 15 – 20 km/hr some medium-sized rivers with slow-moving currents few coal deposits some oil exploration being conducted within 400 miles based on the above information, which energy source would be the most economical and safest for the community to pursue? a. fossil fuel b. hydroelectric c. nuclear d. wind

Identify the area on the image where the force of attraction is the strongest.