I really need help and fast answer all the questions please whoever answers get brainliest 1. A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were
added before each test flight. As each paper clip was added, the plane was tested to determine how far it would
fly.
Independent variable
Dependent variable
Control
Constant
2. Two groups of students were tested to compare their speed working math problems. Each group was given
the same problems. One group used calculators and the other group computed without calculators.
Independent variable
Dependent variable
Control
Constant
3. Students of different ages were given the same puzzle to assemble. The puzzle assembly time was measured.
Independent variable
Dependent variable
Constant
There can be several controlled variables. If an experiment is to be useful, only one variable at a time can
be manipulated intentionally. All other variables must be controlled throughout all parts of the
experiment. If more than one variable is altered (changed), the results of an experiment cannot be
interpreted with any validity.
4. An experiment was performed to determine how the amount of coffee grounds could affect the taste of
coffee. The same kind of coffee, the same percolator, the same amount and type of water, the same perking
time, and the same electrical sources were used.
Independent variable
Dependent variable
Constants (3)

1.  Independent variable- paper clips

Dependent variable- how far it will fly.

Control- mass of plane

Constant- type of plane

2. independent variable- using calculators

dependent variable- who will answer the questions faster

Control- the time the groups get done with the math problems

Constant- the math problems

3. Independent variable- Age of children

Dependent variable- the time it takes to complete the puzzle.

Constant- The type of puzzle

4. Independent variable- Amount of coffee grounds

Dependent variable- The taste of the coffee

Constants(3)- The same kind of coffee, same type of water, and the same perking time.

Explanation: The dependent variable depends on the independent variables change. For example: The amount of coffee grounds determine the taste of the coffee. The coffee grounds would be the independent variable because the dependent variable is the taste of the coffee, and the taste of the coffee determines on how much coffee grounds we use. Constants are the things that stay the same during the experiment. For example: We use the same brand of coffee throughout the experiment, so the brand of coffee is our constant. The controls are the things that do change. For example: The paper clips on the plane weighed the plane down more and more each experiment. So, the control would be the amount of paper clips used each test. The mass could also be a control in this experiment because the change in the paper clips changes the mass of the plane. I did this in 7th grade, and i am in 11th, so I know this is correct. I hope this helps you:)

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation: