Answer:
The correct answer is:
Includes at least two groups, one of which does not receive the experimental treatment. (B)
Explanation:
A controlled experiment is made up of at least two groups of participants (subjects). One group (the test group) receives the experimental treatment, which can be an intervention or a new drug to be tested etc, and the effect of the treatment on the subjects is measured, while the second group of similar subjects also known as the control group acts as a baseline and do not receive the treatment or intervention. They act as a baseline to ensure that the change observed in the treatment group was brought about as a result of the treatment.
<em>Note that repeating the experiment several times does not ensure accuracy of the result, rather it ensures reliability of the results hence option D is not correct</em>
Diseases are the most deadly compared to water supply, tornados, and access to food. And more and more people are dying from diseases as the world gets worse .
Plz mark brainliest
Preventing wind erosion in a dry, sandy area is feasible through any of the following land-use practices:
a. Tillage - creates soil roughness by making furrows and ridges that are perpendicular to the direction of the wind.
b. Crop rotation - rotations of legumes followed by shrubs followed by trees then back to legumes work best.
c. Intercropping - is the most widely used particularly in countries with desert areas. One of the most popularly used is oasis agriculture that makes use of about 3 layers of vegetation.
It is simply transportation
Answer: observe the feeding behaviors of gulls
