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vlada-n [284]
3 years ago
5

I need help please & show work??

Biology
1 answer:
Nezavi [6.7K]3 years ago
5 0

Answer:

Whether or not a given isotope is radioactive is a characteristic of that particular isotope. Some isotopes are stable indefinitely, while others are radioactive and decay through a characteristic form of emission. As time passes, less and less of the radioactive isotope will be present, and the level of radioactivity decreases. An interesting and useful aspect of radioactive decay is half-life, which is the amount of time it takes for one-half of a radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by coTnditions and is independent of the initial amount of that isotope.

Consider the following example. Suppose we have 100.0 g of tritium (a radioactive isotope of hydrogen). It has a half-life of 12.3 y. After 12.3 y, half of the sample will have decayed from hydrogen-3 to helium-3 by emitting a beta particle, so that only 50.0 g of the original tritium remains. After another 12.3 y—making a total of 24.6 y—another half of the remaining tritium will have decayed, leaving 25.0 g of tritium. After another 12.3 y—now a total of 36.9 y—another half of the remaining tritium will have decayed, leaving 12.5 g. This sequence of events is illustrated in Figure 15.1 “Radioactive Decay”.

Explanation:

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The victim was hit in the head with a blunt object. Thus, the correct option is B.

<h3>Who is called a victim?</h3>

A victim is someone who has been harmed physically or emotionally, has had property damaged, or has lost money as a result of a crime.

On the forward wall there is a zigzag pattern and on the walls to the right side, there is a linear pattern of droplets parallel to the floor at about the victim's height. No other marks are found on the other walls. so it might the person hitted by the blunt object so he layed down in and blood marks found in zigzag pattern.

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8 0
2 years ago
Which statement describes Redi's experiment, which helped disprove spontaneous generation?
Lelu [443]

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He examined covered and uncovered meat to determine that maggots came from eggs.

Explanation:

Prior to Redi's experiment and other supporting experiments, it was formerly believed that life could emanate from non-living things, for example, the generation of maggots from rotting meat.

In 1668, a scientist called Francesco Redi disproved the idea of spontaneous generation. He did this when he experimented that the maggots from meats are only as a result of eggs laid by flies when they perched on the meat.

He placed the meat in two jars; an uncovered jar and another in a covered jar with a cloth, after several days, the uncovered jar had maggots on the meat, while the covered jar had no maggot on the meat, but on the cloth. With this experiment, he was able to demonstrate that the maggot arose from the eggs of the flies, not the meat itself which is nonliving and hence, disproved the idea of spontaneous generation.

7 0
3 years ago
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Teresa was told by her doctor that her unborn baby has XY chromosomes. What does this
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The baby is a male. XY = male, XX = female.

Explanation:

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