BIOLOGY MIDDLE SCHOOL

2.Patsy is studying different kinds of weathering. She has four pans full of dried modeling clay. Some she adds water to. Some she freezes overnight, then lets thaw, as summarized in the table below:

PanAdded Water?Froze the pan?1yesyes2yesno3noyes4nono
Then she compares the clay in all four of her pans. The clay in pan #4 was the same at the end of the experiment as it has been at the beginning. The clay in pan #1 had changed and broken up more than the others. 

Which of the following conclusions could Patsy have made?

Frozen clay takes up more space than thawed clay does.

Adding water to clay and then freezing it breaks the clay apart more than either freezing it or adding water to it alone.

Adding water to clay and then freezing it helps plants to grow in the clay more than either freezing it or adding water to it alone.

Wet clay takes up more space than dry clay does.

Answers

Answer 1
Answer: when you add water to something hard as rock when that water freezes it will be hard enogh to break the clay or rock

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Can u help with tee rock part and plz asap I really need help

Answers

half-life = time in which half of material is lost

1/4 = 1/2 x 1/2 so 2 half lives have gone by if only 1/4 of it is left.

age of rock = 2 x half life = 2x1.3 = 2.6 billion years.
Here, Left amount of Uranium = 1/4

So, Number of Half lives gone by = 1/2 / 1/4 = 2

Life after 1 half-life = 1.3 billion years
So, With 2 half-lives, it would be: 1.3 * 2 = 2.6 billion years

In short, The Rock is 2.6 billion Years Old

Hope this helps!

What was Fredrick miescher contribution to the discovery of the genetic code

Answers

Answer:

He discovered the cell nucleus and realized that inside the nucleus there was an unknown chemical substance. That substance was DNA.

Explanation:

Who discovered the DNA was Friedrich Miescher, a Swiss biochemist with great talent. Miescher, using substance precipitation techniques, such as pH changes in the medium, was able to discover and isolate the cell nucleus. Inside the nucleus he was able to isolate a previously unknown substance. It was the nucleic acid, DNA, which, at the moment, with the technology available until then, presented itself only as a white, flocculent precipitate, which Miescher would later call nuclein.

In 1869, Friedrich Miescher isolated "nuclein," DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.                                

To sum it up the answer is yes.

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D.
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Answers

the answer is D.a mutation causing the male to have a larger and more colorful tail. the peacock uses its tails to attract females and the bigger the feathers the more females will be attracted.

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Answers

Crystal minerals are separated into six specific mineral systems. These systems are based on geometry and the angles between the axes. They can be separated even further by sections of "habit", which is the crystals different kind of appearances found in nature. 

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Answers

Pioneer species is the proper term for a community that has reached a stable stage of ecological succession

Answer:

Climax community

Explanation:

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