The diagram above is an illustration of an experimental set-up to demonstrate a property of soil. The property of soil demonstrated is

Which of the following statements would be a correct observation at the end of the experiment? Water moves

The most important factor(s) that influence(s) the ecological niche of an organism is/ are the

The diagram above is an illustration of organisms in an air-tight aquarium.The most important factor needed by the organisms is

Which of the following instruments is used to determine the turbidity of water?