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2 years ago

Which of the following is an object used in relative dating

Biology

2 answers:

lesya692 [45]2 years ago

8 0

Answer: C

Explanation: Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.

Alexeev081 [22]2 years ago

3 0

Option C!!

Using index fossils for age estimates of rock layers is not a new idea. For example..
1) if you have a fossil trilobite and it was found in the Wheeler Formation.
2) Ammonites were common during the Mesozoic Era. They were not found after the Cretaceous period

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Mars had an orbital period of 1.88 years. In two or more complete sentences,explain how to calculate the average distance from m

Vanyuwa [196]

This is an interesting problem involving astronomy, in fact, simple physics.
Let r=distance of sun to mars, in metres

Mars had an orbital period of 1.88 years.
=>
tangential velocity, v, of the planet, in m/s is
$v=\frac{2\pi{r}}{T}$
 $=\frac{2\pi{r}}{1.88*365.25*86400}$ m/s, accounting for leap years
$=3.371*10^{-8}\pi{r}$ m/s

The centripetal force, Fc, generated is
$Fc=\frac{mv^2}{r}$
where m=mass of mars = 6.39*10^(24) kg
$=\frac{mv^2}{r}$
$=\frac{6.39*10^{24}v^2}{r}$
$=7.26168*10^9\pi^2r$

The gravitation pull from the sun, Fg, is given by
$Fg=\frac{GMm}{r^2}$
where G=grav. const., =6.67408*10^(-11) m^3 kg^(-1) s^(-2)
M=mass of sun=1.989*10^(30) kg
$=\frac{6.67408*10^{-11}1.989*10^{30}6.39*10^{24}}{r^2}$
$=\frac{8.4826*10^44}{r^2}$

Since the radial distance is in equilibrium, the average distance, r can be found by equation Fc=Fg and solving for r:
Fc=Fg
=>
$7.26168*10^9\pi^2r=\frac{8.4826*10^44}{r^2}$
Solving for the real root:
$r^3=\frac{8.48256*10^44}{7.26168*10^9*%pi^2}$
$=\frac{1.1681263*10^{35}}{\pi^2}$
=2.279*10^11 m

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3 years ago

Identify the role of DNA polymerase, Ligase, RNA Polymerase, DNA Helicase

likoan [24]

After another enzyme (a DNA helicase) has seperated two orginal strands of DNA, the polymerase moves along the template strand and polymerizes free nucleotides into a new antiparallel strand. ... DNA ligase joins pieces of DNA together, mainly joins Okazaki fragments with the main DNA piece.

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3 years ago

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Can somebody say to me which cells can generate action potential and which cells can generate only electrotonic potential? And i

Nesterboy [21]

Answer:

An action potential is defined as a sudden, fast, transitory, and propagating change of the resting membrane potential. Only neurons and muscle cells are capable of generating an action potential; that property is called the excitability.

Explanation:

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3 years ago

A kind of variable that a researcher purposely changes in an investigation is...

loris [4]

The variable that researchers manipulate is the independent variable.

The reason for this is because in experiments different manipulations are often introduced. The sole purpose of these manipulations is to see whether they will affect our independent variable and if they will change its value.

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3 years ago

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Which is a modification into the spine in a cactus plant? A. Stems B. Leaves C. Buds.

Fynjy0 [20]

I think the correct answer from the choices listed above is option B. A modification of the leaves into the spine in a cactus plant can be seen The spines are modified leaves. It helps defend the plant and also reduce the surface area which helps limit loss of water.

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3 years ago

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