LETTERS A AND B for the correct answer
The dependent variable in the experiment is the time taken for the blocks to hit the ground.
Every experiment must have a dependent variable and an independent variable.
The experiment seeks to determine the effect of changes in the independent variable on the dependent variable. Hence, the independent variable is changed and the effect of this change on the dependent variable is monitored throughout the experiment. In this case, the independent variable is the mass of the blocks while the dependent variable is the time takes the block to hit the ground.
Experimentation is defined as trying something new or testing a theory. One example of experimentation is when trying out new hairstyles. An example of an experiment might be completing a project in a laboratory with test tubes and chemicals to try to better understand chemical reactions. Experiments play an important role in the development of science because they are used to test the reality of thought. Take an axiom or phenomenon that has a rationale and transform it into a law or a theorem like Newton's Law.
Learn more about experiments here
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Shells evolved from ribs. ... Turtles and other shelled creatures use shells like shields to protect themselves from predators, or animals that hunt them. Turtles probably needed a shield on their backs and stomachs because they faced predators in the ocean from both above and below.
A: a battery or alternator problem
