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cupoosta [38]
2 years ago
14

Does galena occur naturally

Biology
1 answer:
maksim [4K]2 years ago
8 0

Answer:

Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver. ... It is often associated with the minerals sphalerite, calcite and fluorite.

Explanation:

Hope this helps

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The second electron transport chain ends with a(n) ______ that creates NADPH.
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2. The right answer is enzymes.
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3 0
3 years ago
Hunt and her team designed an experiment to test her hypothesis about the effect of BPA on mice. They administered daily doses o
katovenus [111]

Answer and Explanation: The figure below shows the doses of BPA administered to the female mice over time.

An experiment is used to determine cause and effect among variables. When the research is for the impact of a treatment, researchers randomly separate individuals in two groups:

  • <em><u>Control</u></em> <em><u>Group</u></em> doesn't receive any treament or a placebo or a treatment whose outcome is already known;
  • <em><u>Treatment</u></em> <em><u>Group</u></em> receives the treatment;

For the female mice on the image below, in the First Group is not injected any dosage of BPA, so they are the control group, while the <u>others</u> are <u>treatment group</u>.

The variables in a experiment are classified as independents or dependents:

  • <em><u>Independent</u></em> <em><u>Variable</u></em> is the cause;
  • <em><u>Dependent</u></em> <em><u>Variable</u></em> is the effect;

For the BPA research, since it is the effect of BPA over time on the mice's cells it is being investigated, <u>dosage</u> of BPA is the <u>independent</u> variable and <em>time</em> is the <em>dependent</em> variable.

6 0
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