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loris [4]
3 years ago
12

Why might a scientist use carbon-14 dating for a tree, but uranium-238 dating a rock

Biology
1 answer:
aksik [14]3 years ago
6 0

Uranium-238 is found only in igneous or volcanic rocks. They can date a very ancient fossil also but carbon cannot date and ancient fossil. Trees are not very ancient. Carbon-14 can be used to measure only fossils of recent age.

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1. The effect of initial population sizes on the growth of populations of an organism was
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When graphing data, we must consider the variables, label axes, define units of measure. In this case, variables are initial population size / final population size, showing an directly proportional relationship.

-------------------------------------

We need to construct a graph illustrating the data in the table.

We can make a <u>dispersion graph</u>. To do it, we need to define variables.

Since we want to know how <em>different initial population sizes affect population growth, </em>

  • the independent variable is the initial population size
  • the dependent variable is the final population size (after 24 hours)

The final population size depends on the initial population size. This is, <em>the number of individuals at the beginning will </em><em>influence</em><em> the final number of individuals</em>.

  • Initial population sizes ⇒X horizontal ax ⇒Unit: Number of individuals
  • Final population sizes ⇒ Y vertical ax ⇒ Unit: Number of individuals

By making a dispersion graph, we can represent the effect of the varying initial population sizes on the final population sizes. We can compare these effects and observe how populations grow as the N₀ increases.

We can also choose a <u>bar graph</u>. In this way, we can compare initial and final population sizes.

This graph will show populations and two bars per population.

  • Blue bar ⇒N₀⇒ Initial population size
  • Red bar ⇒N₁ ⇒ Final population size
  • Different populations ⇒ 1, 2, 3, 4, 5 ⇒ Represented in the X horizontal ax
  • The number of individuals ⇒ from 1 to 324 ⇒ Represented in the Y vertical ax.

By making a bar graph, we can represent initial and final population sizes and compare them. <em>The population that begins with 1 individual, after 24 hours has 4 individuals. The population that begins with 3 individuals, ends with 9 individuals. And so on</em>.

No matter which graph you choose, you will observe a directly proportional relationship between both variables. The bigger is the initial population size, the bigger it ends after 24 hs.

---------------------------------

Related link: brainly.com/question/24827485

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