Answer:
D. tendons, nerves, blood vessels, and bones
Explanation:
Changing several different factors in an experiment takes too many controls.
When only one factor is changed, you don't need to use a control.
When only one factor is changed, you can be more certain that it caused the results.
A. When only one factor is changed, you can be more certain that it caused the results.
There are several ways to make sure the results of an investigation are valid. First, you and others can try to repeat the experiment. In addition, if it is a controlled experiment, you can make sure you have a control, only one independent variable, at least one dependent variable, and constants.
It is especially important to use only one independent variable because when only one factor is changed, you can be more certain that it caused the results. If you change multiple factors, you won't know which one was responsible for the change.
They appear to bend at the surface due to refraction.
They appear to bend at the surface due to diffraction.
They appear to bend at the surface due to interference
The correct answer to the question is: B) They appear to bend at the surface due to refraction.
EXPLANATION:
When light moves from optical rarer medium to optical denser medium, the light rays are bent towards the normal at the point of incidence on the refracting surface. If the order is changed, then the way will be away from the normal.
This property of light is known as refraction which is due to the fact that light has different velocities in different media.
As per the question, the object appears to be bent when it is submerged in water. Actually the object is not bent. Its the light from object which is bent at the air-water interference.
Hence, the correct answer of this question is refraction.
Answer:
answer is b
Explanation:
Answer: THE OPTION IS E(ABOUT 200 MILLONS YEARS
Explanation: