B. 2.883 million kilometer
Answer:
A. Activated B - cells divide to form memory cells.
Explanation:
The vaccine contains the dead version of the respective virus, so that virus will be inactive and it will become easy for the WBC to kill it and antibodies will be formed.
This is done because if we get infected by the virus, our body cells (WBC) will remember that how they killed the first entered virus (the dead version) and it will be easy for them to kill the active virus as they know the antibodies which were formed to kill the inactive virus.
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Answer:B
Explanation: Since there’s more snakes they’ll outweigh the rats and end up eating them until they’re gone unless the snake population decreases
Answer:
B. Native beetle species outcompete the nonnative species.
Explanation:
If native species outdoes the nonnative then the nonnative species cannot become invasive and take over the ecosystem.
