Biology, 04.03.2021 04:40 icantspeakengles
Put the following in the correct sequence. Place a #1 by the first event, #2 next to the second, etc, etc.
a. Oxygen levels in the atmosphere began to increase
b. Eukaryotes lived in the ocean
c. Multicellular life like sponges live in the ocean
d. Modern humans evolve
e. Prokaryotes such as bacteria lived in the oceans
f. Unicellular eukaryotes live close together and begin cooperating
g. Multicellular organisms moved to the land
h. Prokaryotes evolved the ability to do photosynthesis due to a beneficial variation
Answers: 1
Biology, 21.06.2019 19:40
What feature of cell theory is best demonstrated in the image
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Biology, 22.06.2019 13:20
Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.
Answers: 1
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