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Sveta_85 [38]
3 years ago
8

How long ago was it when the supercontinent existed?

Biology
2 answers:
sergejj [24]3 years ago
7 0
The answer would be over 175 years ago
nadezda [96]3 years ago
3 0
The supercontinent Pangaea began to break apart approximately 175 million years ago.
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3 years ago
Please help
Ludmilka [50]
A memory B cell is kinda of how it sounds it has a memory of what your body has fought before such as a virus and can stimulate a response quicker then the first time you encountered it. 

If you lack memory B cells your body doesn't built up the same immune response when you come into contact with the virus again.

"Vaccination would prevent further disease" Incorrect, a vaccine lets you build up memory cells to combat the disease if you lack them you cannot build up a defense.
"Vaccination would not prevent further disease" Correct, a vaccine can be a dead version of a virus or parts of a virus that shows your body what to respond to quickly in the future. If you body cannot make memory b cells it wouldn't help to use a vaccine. Your body wouldn't keep a memory of it being bad.
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"You would over produce histamine" Incorrect, different process for that histamine.
6 0
3 years ago
Crime-scene investigators collected hair from a dead person's body. is the hair human or nonhuman? describe two ways that the in
Nana76 [90]
The investigators could distinguish human hair from animal hair by the patter of pigmentation and by the medullary index.
The pigmentation in human hairs is denser toward the cuticle, whereas in animal hair is denser toward the medulla. Human hairs are usually one colour throughout the whole length, while animal hairs may change colour suddenly.
The medulla in humans is thinner than in animals: the medullary index for human hairs is 0.33 or less; the medullary index for animal hairs is 0.5 or more.
6 0
3 years ago
In what ways are the respiratory structures of all animals similar?
Annette [7]

Answer:

provide a large surface area of moist, selectively permeable membrane.

Explanation:

4 0
3 years ago
There are three types of cells true or false
sveticcg [70]
<h2>False is the answer </h2>

Explanation:

hope it helps ^_^

6 0
2 years ago
Read 2 more answers
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