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Musya8 [376]
3 years ago
7

BRAINLIEST AND 100 POINTS FIRST ANSWER GETS BRAINLIEST!!!

Biology
2 answers:
nexus9112 [7]3 years ago
7 0

Answer:

Half-Life is the time for a substance (U-235 in this case) to decay to 1/2 its original mass.

Since the problem is asking for the time for U-235 to decay to 1/2 its original mass (100 grams to 50 grams) then the decay time is 1 half-life, or 700 million years.

hope it helps u kindly mark as brainliest...

horrorfan [7]3 years ago
6 0

Answer:

A stone artifact that formed 700 million years ago

Explanation:

By the details it is said that Uranium-235 was 700 million years old, so it would make sense for it to be stone since it is stone like.

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Must be moving at a constant velocity

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What type of nosocomial infection is likely to arise from intravenous catheterization?
mrs_skeptik [129]

Answer:

The correct answer is c. Bacteremia

Explanation:

Nosocomial infection is a hospital-acquired infection. Intravenous catheterization is majorly used in hospitals for therapeutic purposes like drug administration, blood sampling, etc.  

These catheters are one of the major causes of nosocomial bacteremia in patients. Bacteremia is the condition in which bacteria is present in the blood.

So these catheter can be contaminated with bacteria which came from a patient and when they are used in another patient without proper sterilization they can transfer these bacteria to other patients blood which then cause nosocomial bacteremia.  

8 0
3 years ago
A student wants to perform an experiment to test the effect of different colored lights on the growth of basil plants. She sets
Elena-2011 [213]

Answer:

light is the independent variable, height of the plant is the dependent variable. Dependent is the effect that based on the independent.

Explanation:

lets break it down. 1) you want to know the effect of something you apply from one thing to another. Let say, if you grow your plants under the sunlight, the plants grow taller. In this case, the sunshine is the independent variable whereas the height of the plant/how tall it can grow is the dependent variable. 2)NOW, before i give the answer. The design of the question is not good for high school students. i think your teacher thinks "light" is the independent variable. 3)However, the question contains confounding variables in it because different lights might produce different effects to the height of the plants. If you want to test if plants are exposed to light grows taller than plants do not expose to light, then you should have all the lights are the same. 4) So, all the plants should be exposed to one certain light to avoid confounding. Confounding means that either red light and sunlight are both produce the same effect whereas the other colors do not help the plants to grow taller. 5)Your teacher should test one light at a time. So, if he is testing with all different colors of light, then light is the independent variable, and height of the plant is the dependent variable.

4 0
3 years ago
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telo118 [61]
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What is the main difference between catalysts <br> and enzymes?
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Answer:

Enzymes are proteins that increase (only) the rate of chemical reactions converting substrate into product.

Catalysts are substances that increase or decrease the rate of a chemical reaction but still remain unchanged.

3 0
3 years ago
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