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3 years ago

The remains of archaic Homo sapiens have been found in each of the following parts of the world except:

Biology

1 answer:

aksik [14]3 years ago

3 0

Answer:

Option E, North America (modern Canada, U.S.A., and Mexico)

Explanation:

Considering the history, Homosapiens fossils were found in Africa in three geological ages –

a) 300000 to 200000 years ago – H. sapiens were found in North and East Africa

b) 130,000 to 100,000 years ago - Levantine and East African

c) 35,000 to 10,000 years old - Upper Paleolithic and geologically younger individuals

Some 50,000 to 40,000 years ago, Upper Paleolithic in Europe were found. Homo eructus remains were found in Beijing (China) some 400,000 years ago.

There is no as such historical instance associated with North America. Hence, option e is correct.

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A wildfire burns a region of a healthy grasslands ecosystem. Which climax community will MOST LIKELY arrive in the burned region

Reptile [31]

Answer:

lichens and bryophytes[secondary seccession]

Explanation:

after the wildfire, the area would bee too dry and therfore it'll lead to a xerarch succession. lichens and bryophytes would be the climax communities.

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3 years ago

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A host organism needs time, often days, to mount an immune response against a new antigen, but memory cells permit a rapid respo

nikklg [1K]

Answer:

The answer is <em><u>D. </u></em>

Explanation:

Viruses can evade the processing and presentation of antigens, for example by interfering with the expression of MHC class I proteins, although this increases their susceptibility to be detected by natural killer cells (NK). However, some members of the herpesvirus, papillomavirus, retrovirus, poxvirus and flavivirus families have also developed strategies to escape the attack of NK cells and promote their survival, inhibiting cell apoptosis. Finally, some pathogens often change surface antigens frequently, as in the case of influenza viruses (orthomyxovirus).

The human immunodeficiency virus (HIV) affects CD4 + T cells and degrades the host's ability to counterattack with a strong cell-mediated immune response. There are so many tactics of immune evasion used by HIV, which have so far hindered the development of an effective vaccine.

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3 years ago

What significance does the temperate zone have on commercial fishing?

Bingel [31]

Answer:

I believe C. greater abundance of commercial species is your answer. hope this helps and have a nice day!

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3 years ago

A researcher is observing the separation of sister chromatids during the process of mitosis in mouse fibroblast cells. If the re

WARRIOR [948]

Answer:

The correct answer is option B. "12 hours".

Explanation:

The process of mitosis in mouse fibroblast cells have been studied and characterized for researches purposes. Therefore, it is possible to predict that it will take around 12 hours for mouse fibroblast cells to begin the process of sister chromatids separation after finishing growing its organelles and synthesizing proteins. If the process takes less time than 12 hours will indicate a premature sister chromatid separation, and that something has caused down regulation or inhibition the histonedeacetylase (HDAC) activity.

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3 years ago

Pure water is neutral. What is the appropriate justification for this? A. Water has equal H+ and OH- ions, making its pH 7, whic

Pani-rosa [81]

The correct solution for this is explained the first option. Since water has an equivalent amount or number of H ions and OH ions, pure water itself is not slightly acidic nor basic. This equality of ions, causes the pH of water to be around the mid point of the pH scale which goes from 0 - 14, and thus is 7. This is a neutral pH.

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3 years ago

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