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GenaCL600 [577]
3 years ago
14

Sam came home from school with a cold caused by a virus and his sister, Ana, caught it from him. Sam got well and went back to s

chool. A few days before Ana got well, Sam came down with a cold again. Their mother said that Ana had given the cold back to Sam. How likely is it that their mother is correct, and what does it mean for Ana's chances of getting sick again?
A. If Sam only had a mild infection of the virus he might not have acquired immunity to it and could catch it again, as could Ana if she had a mild infection.
B. Sam could not get sick with the same virus again since he has acquired immunity to it, so he must have a different virus which Ana could catch.
C. If Sam's body did not store up enough antibodies to the virus he could get sick with it again, as could Ana if the same thing happened to her.
D. Sam could have picked up another virus at school as well as catching the same one from Ana again, so Ana could get sick again with either virus.
Biology
2 answers:
Naddik [55]3 years ago
8 0
Hmm I'm thinking D. Sam could have picked up another virus at school as well as catching the same one from Ana again, so Ana could get sick again with either virus.
Stolb23 [73]3 years ago
7 0

Answer:

the 1st answer

Explanation:

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mars1129 [50]

Answer:

The correct answer is D. an unbalanced force.

Explanation:

If an unbalanced force were applied to the glass of water (for example, someone pushing the glass, lifting it up, etc.), this would cause it to move.  However, a balanced force (if two people were to simultaneously pull the glass in opposite directions with the same amount of force) would not cause the glass to move.  Gravitational force acts on all objects; the force due to gravity is already acting on the cup at rest and will not cause it to undergo motion.  Friction is also already acting on the cup in the form of static friction, making it harder for someone to move the cup, so frictional force will not cause the cup to move either.  Therefore, the correct answer is D. an unbalanced force.

Hope this helps!

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