Answer:
Active immunity occurs when our own immune system is responsible for protecting us from a pathogen. Passive immunity occurs when we are protected from a pathogen by immunity gained from someone else.
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Answer:
Pueden morir por un mal golpe
Explanation:
Un adolescente se puede dar un golpe mal o tan severo que puede quedar paralítico de por vida .
Answer:
a
Explanation:
risk factors for disease or injury
Answer:
Fartlek, which means "speed play" in Swedish, is continuous training with interval training. Fartlek runs are a very simple form of a long distance run. Fartlek training “is simply defined as periods of fast running intermixed with periods of slower running
