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alexandr1967 [171]
3 years ago
12

For dating what kinds of Geologic samples containing uranium is 238U most useful? Why?

Biology
1 answer:
slavikrds [6]3 years ago
3 0

Answer:

After C14, Uranium238  is most widely used mineral in geological or archaeological dating.

Explanation:

U238 is generally used to date the rock materials, to know the age. As we know the half-life of U238, it is easy to identify the age of the materials containing uranium 238. It can be called as absolute dating method as it determines the exact age of the uranium contained material. It is a type of radiometric dating.

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5. A change in an organism's environment that causes the organism to<br> react is called a(n)
Keith_Richards [23]

Answer:

Stimulus

Explanation:

The answer is stimulus. In plural it would be stimuli.

7 0
3 years ago
PLEASE HURRY I WILL MAKE YOU BRAINLIEST Which of the following is a limitation of models? A. It is often easier to study models
docker41 [41]

Answer:

d

Explanation:

The answer would be d because limitation of models is basically about non realistic part of models that separate them from real life which is what d is saying.

3 0
3 years ago
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A gene on human chromosome 15 is expressed throughout the body. However, in the brain, only the maternal copy of the gene is exp
lord [1]

Answer:

C) Through genomic imprinting, methylation regulates expression of the paternal copy of the gene in the brain.

Explanation:

The pattern of gene expression wherein either paternal or maternal gene is expressed in specific cells while the other one is prevented from expression is known as genomic imprinting.

In the given example, the maternal copy of the gene on chromosome 15 is expressed in brain cells while its paternal copy is not expressed in these cells. Hence, the pattern of expression of this gene is regulated through genome imprinting. One of the mechanism is methylation of cytidine residues of CpG islands of the DNA that are more frequently present within promoters of the genes.

When the cytidine residues of these sequences are methylated into 5-methylcytidine, the transcription factors do not bind to these promoters preventing the expression of these genes.

Hence, methylation of cytidine residue in CpG islands of the promoters of the gene present on chromosome 15 could have silenced its expression in brain cells.

6 0
3 years ago
Which processes are involved in sexual reproduction in plants?
lapo4ka [179]

Answer:

Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination. After pollination occurs, fertilization happens and the ovules grow into seeds within a fruit.

Explanation:

3 0
3 years ago
An earthquake has a high magnitude but a low intensity. Which statement best explains this?(1 point)
Lera25 [3.4K]

Answer:

Magnitude and Intensity measure different characteristics of earthquakes. Magnitude measures the energy released at the source of the earthquake. Magnitude is determined from measurements on seismographs. Intensity measures the strength of shaking produced by the earthquake at a certain location.

Explanation:

i hope it helps

6 0
3 years ago
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