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Lelu [443]
3 years ago
14

this is a petoskey stone, which is made up of tiny coral fossils. what can you infer if you find a coral fossil on land?

Biology
2 answers:
kirill115 [55]3 years ago
8 0
WHERE IS THE PICTURE HOW CAN WE KNOW WITHOUT THE PICTURE
madreJ [45]3 years ago
7 0
That it watched onto the land from the sea!

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Which of the following accurately describes a characteristic of fungi?
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People who are lactose intolerant cannot extract energy from milk because:
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Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. People who are lactose intolerant cannot extract energy from milk because no lactase to digest the sugar into energy. To overcome the problem, food manufacturers began to create milk without lactose.

Explanation:

if this helpful can you make me as brainliest

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3 years ago
Iron-55 has a half-life of 3 years. How much of a 40 gram sample will remain after 12 years? A. 0 grams B. 4 grams C. 2.5 grams
Readme [11.4K]

Answer:

\boxed {\boxed {\sf C. \ 2.5 \ grams }}

Explanation:

We are asked to find how much of a 40 gram sample remains after 12 years.

Iron-55 has a half-life of 3 years. Therefore, after 12 years, 4 half-lives have been completed.

  • 12 years/3 years = 4 half-lives

Every time a half-life is completed, half of the sample's mass decays. Remember we start with a 40 gram sample.

  • 1 half- life: 40 g / 2 = 20 g
  • 2 half-lives: 20 g / 2= 10 g
  • 3 half-lives: 10 g / 2 = 5 g
  • 4 half-lives: 5 g / 2 = 2.5 g

There is also a formula that can be used to solve this problem.

A= A_o(\frac {1}{2})^{\frac{t}{hl}

Where A₀ is the initial amount, t is the time, and hl is the half-life.

We know 40 grams is the inital amount, 12 years is the time, and 3 years is the halflife.

  • A₀= 40 g
  • t= 12
  • hl= 3

A= 40 \ g (\frac{1}{2})^\frac{12}{3}

A= 40 \ g (\frac{1}{2})^4

A= 40 \ g * 0.0625

\bold {A= 2.5 \ g}

After 12 years, <u>2.5 grams </u> of Iron-55 will remain.

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