Among the choices presented above, the statement "Butterflies eat nectar from flowers" can be called a direct observation. An observation is the term given to the process of acknowledging and recognizing the facts found around the surroundings. In most times, the observation are expressed by the use of the five senses of man, the sense of smelling, the sense of sight, the sense of tasting, the sense of touch, and the sense of hearing. Observations can either be qualitative and quantitative.
Answer: An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
Explanation:
The correct answer is intensity.
The intensity signifies towards the extent of energy exhausted at the time of performing exercise. The intensity differs with each individual. It has been observed that intensity possess an influence on what fuel the body utilizes and what kind of changes the body makes after performing exercise.
It is the concentration of the physical power, which the body utilizes at the time of doing an activity. For example, the intensity of the exercise illustrates how hard the body has to function to walk a kilometer in twenty minutes.
Among others, both plants and animals need oxygen and water. They also both need space and air.
Answer:
A nucleus and a cell membrane.
Explanation: