The answer is <span>magnets.
Pseudoscience is a belief and not a scientific method. Diet, drugs, and exercise cannot be examples of pseudoscience since it is known they can improve the condition of arthritis. But, on the other side, magnets are not scientifically confirmed as useful in arthritis treatment. There is only a belief that magnets can cure arthritis. Therefore, magnets are the exaple of pseudoscience.</span>
Answer:
Rovers
Explanation:
Rovers have been employed in the study of planets other than the earth. For example in 2003, NASA went on an exploration of the planet, Mars with the aid of rovers. Rovers are able to pick up information regarding the biosphere of other planets.
In 2014, NASA also reported the use of the Curiosity and Opportunity Rovers to study the Martian environment. So, rovers are an improvement in technology that can aid our understanding of other planets.
I am 100% positive it is C. Have a ice day ( ^ω^ )
Explanation:
If the density of the object is more than that of water, it will sink. Otherwise it will float. The density of water is 1 g/mL.
Substance 1,
Mass, m = 450 g, Volume, V = 90 mL
Density = mass/volume
So,

It will sink.
Substance 2,
Mass, m = 35 g, Volume, V = 70 mL
Density = mass/volume
So,

It will float.
Substance 3,
Mass, m = 24 g, Volume, V = 12 mL
Density = mass/volume
So,

It will sink.