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vekshin1
2 years ago
9

All organisms and the natural cycles of the earth operate:

Biology
1 answer:
Shkiper50 [21]2 years ago
5 0

Answer:

Together

Explanation:

All of the organisms need each other to survive, all of the natural cycles are necessary to keep the Earth in balance.

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Continents grow by a process called ____
AURORKA [14]
Formation of continental crust
6 0
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.

4 0
2 years ago
Determine the hardness of each unknown mineral from the data given.
iogann1982 [59]

Answer:

b

Explanation:

it is a 4 on the scale, I assume that's what you meant by the numbers.

7 0
3 years ago
Read 2 more answers
Which reaction best explains why carbon is able to from macromolecules ?
guajiro [1.7K]

Answer:

Carbon can bond with many elements

Explanation:

Carbon can bond with many elements, including itself, to form macromolecules. Moreover, it can form four bonds, and that makes possible many different arrangements of the atoms in the molecules.

A is <em>wron</em>g. Carbon is among the seven smallest elements in the Periodic Table.

C is <em>wrong</em>. Carbon is found in living things because it can form macromolecules, not the other way around.

D is <em>wrong</em>. Carbon can bond with many other elements beside itself.

4 0
3 years ago
Chemical substances that organism require to live
Arisa [49]
Oxigen ,nitrogen ,carbon,and hydrogen.
5 0
3 years ago
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