It will be 50% 50%
you will get the letter from one parent and the letter )as in negative and positive) from the other parent.
Answer:
The skin
Digestive tract
Vagina
Mucous membrane
Explanation:
The skin prevents microbes from entering the body
Digestive tract e.g. stomach acid is a natural defence mechanism
The vagina is acidic and this prevents harmful bacteria from growing with it's own flora.
Mucous membranes e.g. lining of the mouth, nose, eyelids are all defense mechanisms.
Answer:
Environment
Explanation:
In a research study, internal validity refers to how well an experiment was carried out and to what extent the piece of evidence supports a claim.
The lesser the chance of confounding in a study the higher the internal validity.
Study of memory is possible through learning the electrical activity created by neurons.
Therefore, thunderstorm will affect the readings hence it is an Environmental threat to the internal validity.
