The answer is a patent and is valid for 20 years
Descriptive investigations involve collecting data about a system, but not making tests or experiments.
Making tests belongs to experimental investigations.
Descriptive investigations aim to draw conclusions from observations of the fenomena, while experimental investigations design tests that let the researcher to compare results on different conditions with a control situation.
There is also the so called comparative investigations which collect data from under different conditions but do not include the control situtation.
Answer:
Explanation:
The arousal theory of motivation suggests that we are always looking for different activities that allow us to maintain an optimal level of psychological arousal. If Jim and Mariee want to keep their level or arousal, they will look for an activity that implies physycal movement an, maybe, some sort of risky feelings, for example, running on the streets at night or climbing some tree. If they want to lower their level of psychological arousal, they will do something that doesn't imply that much risks or moving, for example, playing cards, watching a movie, etc.
Answer:
The chemical reaction of burning methane and oxygen is as follows;
(A (the entire green box): chemical equation
B (the blue box): reactants
C (the arrow): reacts to form
D (the purple box): products (This is the chemical equation)
Here, the reactants are methane and oxygen, one mole of methane reacts with 2 moles of oxygen present in the air;
and the products thus formed are one mole of carbon dioxide and two moles of water.
So here, methane and oxygen reacts to form carbon dioxide and water.
Explanation:I hope I can help you :)
