1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
xz_007 [3.2K]
3 years ago
11

Can you please help me?

Biology
1 answer:
sashaice [31]3 years ago
7 0

Answer:

3rd option is false

Explanation:

Everything that is natural comes from Earth, For example, fruits, trees, rocks, dirt, etc.

hope this helps.

You might be interested in
Which method is best for seperating salt and breadcrumbs?
Tanzania [10]

Answer:

Filtering to obtains breadcrumbs and the heat the salt solution to saturation and cool it

8 0
2 years ago
Suppose the femur bone of an animal has 1,000 atoms of carbon-14 when the animal dies. How many atoms of carbon 14 will be prese
shtirl [24]

Answer:

After 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

Explanation:

The half-life of a radioactive isotope of an element is the time taken for half the atoms present in a given amount of the element to undergo decay or disintegration. For example, the half-life of carbon-14 isotope is 5730 years. This means that, if there are 100 atoms of carbon-14 present in a given sample of a material, in the next 5730 years, approximately, 50 atoms of carbon-14 will be left in the material.

Since the half-life of radioactive isotopes are constant, these radioactive isotopes are used in the determining the ages of ancient life-forms as well as rocks.

In the given example, after 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

8 0
3 years ago
Kyle is holding a bag of 250 jelly beans. When Mark takes out two jelly beans, Kyle is not able to tell a difference. This illus
sp2606 [1]
This illustrates <span>absolute threshold. The correct option among all the options that are given in the question is the second option or option "B".

</span><span>A spot in the middle of the retina that only contains cones is called the fovea. The correct option among all the options that are given in the question is the third option or option "C".</span>
4 0
3 years ago
Read 2 more answers
How are radioactive isotopes used to date rocks? ...?
Stolb23 [73]
Some isotopes, however, decay slowly, and several of these are used as geologic clocks. Dating rocks by these radioactive timekeepers is simple in theory, but the laboratory procedures are complex. <span>All methods rely on the fact that certain elements (particularly uranium and potassium) contain a number of different isotopes whose half-life is exactly known and therefore the relative concentrations of these isotopes within a rock or mineral can measure the age.</span>
8 0
3 years ago
Volume of blood ejected from the left ventricle into the aorta each minute is called
enyata [817]
The volume of blood ejected from the left ventricle into the aorta each minute is called cardiac output.
<span>Cardiac output can be defined as the product of the heart rate or the number of heartbeats per minute (bpm), and the stroke volume which is the volume of blood pumped from the ventricle per beat.</span>
4 0
3 years ago
Other questions:
  • Which of the following can be accurately said about climax communities?
    6·1 answer
  • Description of proton
    7·1 answer
  • Fires help some forest communities by allowing some trees to release their seeds, by clearing away dead wood, and by encouraging
    10·1 answer
  • If a steam that is septic (anaerobic) receives further human waste containing carbon, nitrogen and sulfur containing materials,
    15·1 answer
  • Why does carbon dioxide go to ur lungs? is this safe?
    5·2 answers
  • Which of the following statements about gel electrophoresis is correct?a. Longer DNA fragments migrate farther than shorter frag
    12·1 answer
  • As a general rule, should sample turbidity corresponds to sample fluorescence in liquid E.coli cultures?
    11·1 answer
  • How are meiosis and mitosis different?<br><br> 'FREE BRAINLIEST INCLUDED'
    12·2 answers
  • True or False. Every somatic cell in your body has the same copy of DNA Explain your reasoning Answer:
    5·2 answers
  • How could we make a model of the Milky Way galaxy that shows Earth's location?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!