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Vladimir79 [104]
3 years ago
11

Two samples of radioactive material from the same rock is prepared for testing. Sample A is cut into a 2 inch cube. Sample B is

crushed into a fine powder. Compared to the half-life of the material in Sample A, the half-life of the material in the powdered Sample B is:
Biology
1 answer:
salantis [7]3 years ago
7 0

Answer:

The same

Explanation:

Half life is the time taken for the number of atoms in a radioactive sample to decrease to half of the initial number of atoms. It is also the time taken for the activity of a radioactive sample to decrease to half of its original value.

If samples A and B were obtained from the same rock, then they contain the same number of atoms having the same initial activity even though the samples were not prepared in the same way for analysis.

Hence, samples A and B have the same half life.

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GenaCL600 [577]

Answer:

The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.

8 0
3 years ago
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In mice, brown eyes (B) are dominant over blue (b). A homozygous brown-eyed male mouse mates with a blue-eyed female and they ha
bazaltina [42]
Parents: Homozygous brown-eyed (M) - B B
                                    blued-eye (F)     -  b b    [since blue (b) is recessive then                                                                                      and brown (B) is dominant then
                                                                           in order for the blue gene to
                                                                           show the you need double                                                                                              recessive or the brown
                                                                           gene absent 

Offspring:
So based on the Punnett cross then you realize that all the possible of spring carry the genotype B b and as such the phenotype brown eyes
                                                                          

8 0
3 years ago
What causes changes in air pressure in the atmosphere
harina [27]

Answer:

Air pressure is caused by the weight of the air molecules above

Explanation:

Air pressure is caused by the weight of the air molecules above. Even tiny air molecules have some weight, and the huge numbers of air molecules that make up the layers of our atmosphere collectively have a great deal of weight, which presses down on whatever is below.

5 0
3 years ago
In which cell will the molecules diffuse in. A or B
lora16 [44]

Answer: I believe <u>option A.</u> is correct.

Explanation: When you look at both the cells, you see that cell A. shows the molecules diffusing in and out of the cell membrane. Where as, cell B. doesn't show as much.

Hope I could help! :)

7 0
3 years ago
Which of these characteristics is shared by algae and seed plants? Which of these characteristics is shared by algae and seed pl
Tomtit [17]

Answer:

the correct answer is: chloroplasts

Explanation:

Chloroplasts are the cellular organelles that in photosynthetic eukaryotic organisms take care of photosynthesis.

The characteristic shared by both algae and seed plants is the presence of chloroplasts. Algae and seed plants both have chloroplasts.

5 0
3 years ago
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