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3 years ago

Which statement about how geologists study the age of rock layers is true

Biology

2 answers:

elena55 [62]3 years ago

8 0

Answer:

The principle of original horizontality provides the basis for the law of superposition.

Explanation:

The principle horizontal principle explains that all strata were originally horizontal in sedimentary rocks.

This is a correct answer

hope this helps!

notka56 [123]3 years ago

8 0

Answer:

Option-(C):It is the best option to choose from the given four.

Explanation:

We have the following explanation to the given option selected by us;

Law of superposition- It states that the younger layers of the rock sediments occur on top of the earth surface while, the older layers occur beneath them with a given sequence if there was no disturbance occurred in the sequence formation.
Principle of original horizontally: According to the following principle the rock sediments or layers of the earth are formed starting horizontally, as the folded and tilted strata are analyzed through by this principle.

As, the geologist do the analyses of earths layer and they measured the age and the position of the sediments present in the earth layers, to find its properties.

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What Amendments affect election or tenure of officeholders?

MrRissso [65]

Answer:

the twenty second amendments to the united states

Explanation:

limits the number of times of a person is eligible for election to the office of president of the united states to two,and sets additional eligibility conditions for president who succeed to the unexpired terms of their predecessors

7 0

3 years ago

22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit

mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square ( $X^2$ ):

$X^2$ = $\frac{(O - E)^2}{E}$ where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The $X^2$ is calculated thus:

Phenotype O E $X^2$

1 88 164.81 $\frac{(88 - 164.81)^2}{164.81}$ = 35.80

2 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

3 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

4 81 18.31 $\frac{(81 - 18.31)^2}{18.31}$ = 214.64

Total $X^2$ = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

$X^2$ tabulated = 7.815

The calculated  $X^2$  exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently. 

4 0

2 years ago

Species A has a breeding call that is completely different from Species B. This difference in breeding call leads to

Minchanka [31]

Answer: The correct answer is option a.

Explanation:

Prezygotic isolation is a mechanism by which mating and fertilization is prevented. Thus, it prevents the formation of a zygote.

It can be achieved by various reasons such as temporal differences (difference in mating seasons), habitat isolation, behavioural differences (different mating rituals such as different dance patterns, voice calls, et cetera), mechanical isolation, et cetera.

Thus, different breeding calls prevent the species to interbreed with each which ultimately prevent the formation of zygote formation.

Hence, it is a type of prezygotic isolation.

3 0

3 years ago

Read the following sentence from the section "The

Setler79 [48]

Answer:

The particles that cause the aurora are energized in the magnetosphere, that is, above the atmosphere. If they don't reach 10,000 volts, they will still cause auroral light. The lower energy won't change the wave length of the light, but will cause the light to be dimmer.

Explanation:

4 0

2 years ago

What are two thirds of an amoeba made out of

adelina 88 [10]

Cells because they are living things. Hope this helps! ;D

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3 years ago

Which statement about how geologists study the age of rock layers is true​

Which statement about how geologists study the age of rock layers is true