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Vadim26 [7]
2 years ago
10

You are the lucky student of a wacky professor who develops a time machine. She asks if you will test it with her. You get in an

d there is an immediate glitch - the date readout fails so that when you land you are not sure what eon/era you are in. As your time machine lands, you see an unusual landscape before you. As you open the door you realize you cannot breathe. You quickly shut the door, realizing you are in the ___________.
1) Archaean eon2) Cambrian period3) Cenozoic era4) Mesozoic era
Biology
2 answers:
scZoUnD [109]2 years ago
7 0

Answer:

1) Archaean eon

Explanation:  

Archaean eon  -

During the Archaean eon about 3.8 billion years ago, the earth's atmosphere was three times hotter than today's atmosphere. Earth's atmosphere was mainly more carbon dioxide and none of the Oxygen was in the atmosphere. In Archaean eon sedimentary rocks, stromatolites and first one-celled organisms appeared.

During Cambrian period sudden increase in diversity of many animal phyla was observed.

In Cenozoic era extinction of dinosaurs and rise of earliest homo sapiens has seen.

Semmy [17]2 years ago
6 0

Answer:

1) Archaean eon

Explanation:

In this geological period there is a report that the availability of atmospheric oxygen was very low or almost zero. In this era, photosynthesis was initiated and with it the production of oxygen as a waste substance of this process, however, being the levels probably at only 1% to 2% of its current level would not allow a human of this time to breathe.

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Each ABO blood group is associated with the presence/absence of RBC antigens and the presence/absence of antibodies in the plasm
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Answer:

a. Type O blood - No A or B antigens on RBCs-Anti-A antibodies in plasma-Anti-B antibodies in plasma

b. Type A blood - A antigen on RBCs- Anti-B antibodies in plasma

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d. Type AB blood - A antigen on RBCs- B antigen on RBCs- Neither anti-A or anti-B in plasma

Explanation:

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Type A blood group has A antigen on RBC and has antibody B in the plasma.

Type B blood group has B antigen on RBC and has antibody A in the plasma.

Type AB blood group has both the antigens i.e. antigen A and B on RBC and does not have any antibody in the plasma which makes it a universal acceptor.

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