Answer:
C
Explanation:
D in my opinion wouldn't be correct because a vaccine is for if you come in contact with the sickness you are more protected and helps build immunity. So healthy people get them to try and build immunity against said vaccine. Like if you have the flu, your body is fighting. In the Flu vaccine parts of the flu are in the vaccine to help your body learn to become immune. So option C.
Sorry if this is confusing, hope it helps!
Animals with bilateral symmetry can be divided equally along only one plane.
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It is the total mass of organisms in the given area
Ecosystems disturbed by a nature will be eventually restored unless it's a really big cataclysm, but most of the ecosystems are now a human caused disturbance. For example there are plenty of species which are already extinct or nearly extinct because of hunting industry.
<span>It is composed of water and other soluble ions. About 80% of the cytoplasm is water. It also contains dissolved carbohydrates, proteins and fats.
</span><span>It is a very good conductor of electricity.</span>
