Answer:
16 - b
17 - c
18 - e
19 - d
20 - a
Explanation:
Cardiovascular system - Some activities may be limited
because this system is less elastic
in old age
Skeletal system (Bones) - The older person must be
protected from falls because this
system is more brittle with
Digestive system - The older person should eat a diet
high in fiber because this system
is slowed down.
Respiratory system - The older person can't take in as
much air as before because this
system is weaker.
Immune system - Older people need to be protected
from infection because this system
does not work
as well as it did.
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