A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment? A. Yes, because there is more than one variable.
B. Yes, because there is one variable and a control
C. No, because there is not more than one variable
D. No because there is only one variable and a control

Answers

Answer 1

Answer:

Answer:

The correct answer is option B. yes because there are one variable and a control.

Explanation:

The validity of experiments can be tested by the four components of experiments. These four components are control, dependent variable, independent variable, and constants. All of this basic component is the validity of the experiments.

In this experiment there is the control where experiment is performed within controlled and there is also one variable.

Thus, the correct answer is option B. yes, because there are one variable and a control.

Answer 2

Answer:

Answer:

The correct answer will be option-B.

Explanation:

A scientific experiment must contain three variables: independent variable (which can be manipulated), dependent variable(which can be tested) and control (which is kept constant).

Experimental samples must be divided into two groups: an experimental group in which variable to be studied is tested and a control group in which the independent variable does not influence the experiment.

In the given question, since experimental design contains variables and the experimental as well as the control group which act as a reference group to the experiment.

Therefore, Option-B is the correct answer.

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What can be said about prokaryotes and eukaroytes?a. Prokaryotes always have a nucleus, but eukaryotes don't.b. Both of these cell types contain a nucleus.c. Eukaryotes always have a cell membrane, but prokaryotes don't.d. Both of these cell types contain genetic material.
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What is the coldest layer of the Earth's atmosphere?

Answers

Answer:

The correct answer is mesosphere.

Explanation:

The atmosphere exhibits five distinct layers, which are determined by the modifications in temperature that take place with the upsurging altitude. These are troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Of the mentioned layers, the mesosphere, that is, the layer present above the stratosphere is considered as the coldest layer of the atmosphere. The coldest portions of the atmosphere are situated in this layer and can reach up to -90 degree Celsius.

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The final storage of liquid waste for the body:kidneys
bladder
urethra
medulla

Answers

The final storage of liquid waste for the body is the bladder.

Answer: bladder

Explanation: i just took the quiz

Fred has an extremly rare autosomal recessive disease, so what is the chance that both of his grandfathers are carriers? Our teacher said this homework assignment involves Hardy-Weinburg equilibrium but we are pretty sure this is not one. Can someone please help us out and explain the answer even if it is not hardy weinburg

Answers

the answer is is 50% because if the disease is a recessive trait, his grandparents could've gotten the gene of the disease from their parents, so its 50-50 chance that his grandfathers are carriers, but it mostly depends on what genes their mom and dad gave the grandfathers, and then they probably passed the gene on their kids, and then their kids passed the gene onto fred, and he ened up with the disease.

hopefully this helps you

What is the scientific definition of energy? A. the ability to use the stored potential of an object B. the ability to use the change in direction of an object C. the ability to use an applied force in order to make an object move D. the ability to use the change in temperature of an object

Answers

Correct answer: C). The ability to use an applied force in order to make an object move

The energy can be defined as the capacity to move an object by the application of the force. It can exist in various forms such as chemical, electrical, mechanical and nuclear. It can not be created but it can be transformed from one form to another form of energy. It is the driving force of the universe.

Hence, the correct answer would be option C.

the answer is C. The ability to use an applied force in order to make an object move.

A cell’s relatively constant internal physical and chemical conditions are called __________.A. hemostasis

B. homeostasis

C. osmosis

Answers

B. homeostasis is the term that is used to describe a cell's relatively constant internal physical and chemical conditions.

Why are flowering plants more efficient at pollinating than gymnosperms?

Answers

bees can get in and out, carrying pollen with them from flower to flower pollinating as they go. On the the other hand, Gymnosperms have to let their seeds somehow travel away and plant itself, or with the help of nature, they plant themselfs
But it is easier for those flowering plants to pollinate.
=)

Gymnosperms usually have their seeds enclosed in cones. The cones have to either fall to the ground or be eaten by an animal for the seeds to be released. It is amore protective covering than the fruity covering of Angiosperms. Angiosperms seeds may be carried by wind and pollinators, like insects, birds, animals.

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