Experiments are often performed in laboratories because of letter b, you can control more variables more easily. It is because you have enough supplies in the laboratory where it is accessible, making it easy to control and to conduct the experiment that is going to be made. For having an accessible and easy control in variables is essential to do because in creating an experiment, a lot of things are needed and used.
Answer:
Tension and Gravitational Force
Explanation:
The question says that a monkey is hanging, he neither drops down to the ground nor moves up. He keeps hanging on a vertical vine.
Since, the monkey is hanging, two forces acts on the monkey, one force is due to his weight, i.e., the gravitational force which tends to pull him downwards and the other is due to the tension developed in the string which is in upward direction.
Thus to keep the monkey in the hanging state both the forces must counter balance each other and maintains the system 's equilibrium.
Therefore, both the forces must be equal.
The water cycle starts with evaporation. It is a process where water at the surface turns into water vapors. Water absorbs heat energy from the sun and turns into vapors. Water bodies like the oceans, the seas, the lakes, and the river bodies are the main source of evaporation. Through evaporation water moves from hydrosphere to atmosphere.
D) all of the above is the answer
