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Reika [66]
3 years ago
15

Why can scientists not always divide a period into epochs

Biology
2 answers:
kozerog [31]3 years ago
6 0
<span>Too little is known about pre-Archean time, from the origin of Earth to 3.8 billion years ago, to divide that period into units.</span>
Savatey [412]3 years ago
3 0
<span>Too little is known about pre-Archean time, from the origin of Earth to 3.8 billion years ago, to divide that period into units.</span>
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Please help me!!!!!!!​
mario62 [17]

Explanation:

a iv

b viii

c ii

d i

e iii

g i

f. single cotyledon it's v

two cotyledon it's vi

5 0
2 years ago
What has the base Thymine?
goldfiish [28.3K]
Video: DNA: Adenine, Guanine, Cytosine, Thymine & Complementary Base Pairing. Learn the language of nucleotides as we look at the nitrogenous bases adenine, guanine, cytosine and thymine.

5 0
3 years ago
The alleles that control which blood group antigens appear on the surfaces of red blood cells are:
evablogger [386]
<span>the alleles that control which blood group antigens appear on the suface of red blood cells are codominant.</span>
8 0
3 years ago
You will develop a brief portfolio detailing the history of tsunamis in a modern society that could be used to teach others.
Maru [420]

The 2004 Sumatra Earthquake and Indian Ocean Tsunami gave us a vivid description of menace of major tsunamis. It also suggested that tsunami science and engineering were inevitable to save human society, industries, and natural environment.

An answer can be found in Japan. Japan is the country the most frequently hit by tsunamis in the world. The experiences are well documented and are continued as the local legends. In 1896, the tsunami science started when the Meiji Great Sanriku Tsunami claimed 22,000 lives. An idea of comprehensive countermeasures was officially introduced after the 1933 Showa Great Sanriku Tsunami. The major works taken after this tsunami, however, were the relocation of dwelling houses to high ground and tsunami forecasting that started in 1941. The 1960 Chilean Tsunami opened the way to the tsunami engineering by elaborating coastal structures for tsunami defense. The 1983 Japan Sea Earthquake Tsunami that occurred during a fine daytime cleared the veil of actual tsunamis. The 1993 Hokkaido Nansei-Oki Earthquake Tsunami led to the practical comprehensive tsunami disaster prevention used at present, in which three components, defense structures, tsunami-resistant town development and evacuation based on warning are combined.

The present paper briefs the history of tsunami research in Japan that supports countermeasures.

3 0
2 years ago
Lupus, a condition in which the body attacks its own cells, is an example of
riadik2000 [5.3K]

Answer:

<em>Option 4, an autoimmune disorder, is the correct answer.</em>

Explanation:

An autoimmune disorder can be described as a disorder in which the immune cells of a body attack the own cells of a body.

Lupus can be described as an autoimmune disease which is long termed. In this disorder, a person's immune system attacks its own healthy cells. The immune system is unable to differentiate between the pathogenic cells and the healthy cells of the body. As a result, tissue damage is caused.

5 0
3 years ago
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