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Elis [28]
3 years ago
14

Scientists are uncertain about how life began on Earth.Why?​

Biology
1 answer:
Ksju [112]3 years ago
6 0
By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
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About 225 million years ago, North America and South American were part of one huge landmass, Pangaea.
Advocard [28]
This is not even a question. Is it a true or false question if so tell us.
8 0
3 years ago
How can karyotype analysis explain genetic disorders lab 15 2 answers?
damaskus [11]

A karyotype is a picture in which the chromosomes of a cell have been stained so that the banding patterns of the chromosomes appear. This way it is possible to view abnormalities in the chromosomes. Disorders such as aneuploidy can be diagnosed by karyotype. It can also help identify local abnormalities on chromosomes such as abnormalities in chromosome length,  and location of the centromere.






4 0
3 years ago
N pea plants there is complete dominance for the trait of flower color. the p allele produces purple flowers and p produces whit
Reptile [31]
PP-  purple homozygote
pp- white homozygote
Pp- purple hetrozygote

If these flowers cross, we obtain heterozygote offsprings with a genotype: Pp (100% of them will be like this)

Now, if those offsprings cross with each other: Pp x Pp
results:
  1/4 would be purple  homozygote -> PP
  1/4 would be white -> pp
  2/4 would be purple heterozygotes -> Pp
Genotipic ratio: 3:1 (3 are purple; 1 is white)
7 0
2 years ago
What is the fastest way to administer nicotine to the brain?
Agata [3.3K]

Answer:

d. Smoking

Explanation:

Nicotine is a chemical found in many plants such as tobacco. It is one of the 4000 chemicals that tobacco presents and the main component that acts in the brain.

This chemical is absorbed through the skin and lining of the mucosa of the nose and mouth, or in the lungs by prior inhalation. Nicotine can quickly reach the bloodstream and brain and reach maximum levels. The action of smoking cigarettes causes nicotine to reach the brain in just 10 seconds after inhalation. Although the acute effects dissipate in a few minutes, they cause the need to continue the intake of the substance (addiction)

5 0
3 years ago
What should the Oreos and mice researchers do next to increase the credibility of their research?
docker41 [41]

Answer: The should gather all the data the collected on the Oreos and mice and make sure all of there data is still factual information.

6 0
2 years ago
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