The Fossil record is the history of life as documented by fossils, the remains or imprints of the organisms from earlier geological periods preserved in sedimentary rock.
D all of the above
explained it in class with other students
Answer:
3. Only one independent variable is used for each experiment.
Explanation:
A controlled experiment is an experiment in which one variable is changed or tested at a time, while others are kept constant. In an experiment, one of the two major variables is INDEPENDENT VARIABLE. Independent variable is the variable that is changed or manipulated in the experiment.
In a controlled experiment, only one independent variable is used at a time i.e. ONLY one variable is changed or manipulated for each experiment. This is to ensure the validity of the experiment.
B. Convergent Boundaries
If two tectonic plates collide, they form a convergent plate boundary.