How do scientists use radioactive decay to date fossils and artifacts?

1 answer:

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Scientists use radioactive decay to date fossils and artifacts through a process called carbon dating it measures the amount of carbon still left in a dead object. The less carbon that exists, the longer that animal or plant as been dead.

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A student set up an experiment to show that carbon dioxide is consumed by Elodea plants during photosynthesis. She filled two te

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Answer: The NEGATIVE CONTROl is the test tube that is filled with ONLY distilled water.

Explanation:

A negative control of an experiment is carried out alongside the main primary experiment except that the treatment is changed to something that is predicted to have no result. In the negative control, the student does not expect any response. This would help the student compare the result of a new experiment against an already known existing results.

Analysing the experiment carried out by the student, She filled two test tubes with distilled water and placed a piece of Elodea in one of the tubes, leaving the other without a plant. The other test tube that contains only distilled water is the negative control because she wasn't expecting any result from it. It's also served as a control sample to the primary experiment. This is observed as she blew in each tube to add carbon dioxide, which caused the distilled water to become more acidic. This would help the student know that the that experimental results are valid and to ensure that time is saved.

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Suppose that meiosis occurred in the mother and father whose chromosomes you labeled in question 1. During meiosis,

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Explanation:

you will end up with 24 chromosomes instead of the standard 23 and have down syndrome

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5. Mutations in DNA occur when there is a change in the base-pair sequence of a

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Answer:

C. Mutations always cause a change in the in the way an organism looks.

Explanation:

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What causes the ocean waves that surface use for their sport ?

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Wind blowing across the water creates friction and pulls the water along with it. This creates small waves. these waves then slowly build as they go farther until you get a large wave.

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Which of the following are substances in plant foods that are not absorbed by the body?

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Answer: dietary fiber

Explanation:

The dietary fibers can be defined as those nutrients in the diet which cannot be digested by the gastrointestinal enzymes and the minerals from them are not absorbed by the body. These keep the bowel full after food intake for long. These prevent disease like diabetes as reduces the need for consumption of more food, heart disease and constipation. The fruits, vegetable, legumes, fibers are the sources of dietary fibers.

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