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marshall27 [118]
4 years ago
6

Which of the following is a metal? A. Iron (Fe) B. Calcium (Ca) C. Sodium (Na) D. all of these

Biology
1 answer:
agasfer [191]4 years ago
3 0

Answer:

all of these

Explanation:

i just got it right

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Which of the following is TRUE about this reaction?
hoa [83]

The right answer is C

This process is called anaerobic respiration. It doesn't need dioxygen to occur (it can happen with or without O2).

Anaerobic respiration is a mechanism in which electrons pass through a chain of transporters whose final acceptor is a mineral substance other than oxygen, unlike aerobic respiration where the final acceptor is dioxygen. The final acceptor may be the nitrate ion (as in the case of Pseudomonas), carbon dioxyde or the sulfate ion.

Some bacteria (Pseudomonas) are able, anaerobically, to reduce nitrates to nitrites and then, depending on the case, to dinitrogen (with the enzyme Nitrate reductase A).

NO3- ==> NO2- ==> N2.

5 0
3 years ago
The half — life of nickel is 96 years. How much of a 30-gram sample is left after 270 years?
-Dominant- [34]

The amount of the 30 gram-sample that will remain after 270 years is 6.61 grams

<h3>How to determine the number of half-lives </h3>

We'll begin by obtaining the number of half lives that has elapsed. This can be obtained as follow:

  • Half-life (t½) = 96 years
  • Time (t) = 270 years
  • Number of half-lives (n) =?

n = t / t½

n = 270 / 99

n = 2.8125

<h3>How to determine the amount remaining </h3>
  • Original amount (N₀) = 30 grams
  • Number of half-lives (n) = 2.8125
  • Amount remaining (N) =?

The amount remaing can be obtained as follow:

N = N₀ / 2^n

N = 30 / 2^2.8125

N = 6.61 grams

Learn more about half life:

brainly.com/question/26374513

#SPJ1

5 0
1 year ago
PLS help!!!!!! brainliest!!!! which activity produces an action potential in nerve cells?
olga55 [171]

Answer:

C. release of neurotransmitters

Explanation:

The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about -55 mV a neuron will fire an action potential.

7 0
3 years ago
Data from a scientific investigation should be presented in what format?
Amiraneli [1.4K]
<span>The answer to this question would be: b.)Data should be presented in a clear and organized manner.

The data should be presented in the best way to read it. The original format of the data might be confusing to read. It could be graph or anything that make the reader can understand what point you want to make. Putting the research method also a good idea since the reader might want to verify the research validity before looking the data.
It doesn't have to be presented orally since most of the scientific report will be written.</span>
8 0
3 years ago
Select a location within each of the following biomes and fill in the missing information on the table.
mr Goodwill [35]

Answer:

30 million species and 25° and 50° latitude in both hemispheres I don't have an exclamation for the species sorry I hope this helps

Explanation:

Such forests occur between approximately 25° and 50° latitude in both hemispheres.

7 0
3 years ago
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