A scalar quantity is a quantity that has magnitude only but no direction, while a vector quantity is a quantity that has both magnitude and direction:
Let's go through the choices:
Displacement: you can move from one point to another towards east, west, north,....etc. This means that displacement has both magnitude and direction. (vector)
Time: time has no direction whatsoever. (scalar)
Velocity: velocity is mass*acceleration. The acceleration can be towards any direction. Your velocity can be towards any direction. Since acceleration is vector, therefore, velocity is also a vector quantity.
Force: a force can push a body right, left,...etc. This means that the force has a direction as well as a magnitude. (vector).
Based on the above, the scalar quantity is:
(B) Time
Answer: A elements that are chemically combined
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The environment affects natural selection. Speices need to adapt to changes in environmnet. The weaker organisms which fail to adapt to environment perish while the stronger ones who adapt to the environment survive. This is how environment affects natural selection.
