True. It is the presence of more than one disease.
The answer is D for this one
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.
According to a quick g-o-o-g-l-e search, D. Reflexology, seems to be the correct answer!
In short, reflexology is a type of massage that involves applying varied amount of pressure to the feet, hands, & ears.
Hope this helped!
(If I'm wrong, please let me know in the comments)
I believe the answer would be B because at one years old, children don't have much strength to hold their own body weight. they can't do a pull up, they can't run a mile without resting, and they can't do a cartwheel. remember, children develop as they grow and at one years old, they are still developing. maybe at like 7 or 8 they can do something but besides that, the answer is B.
I hope this helps!
Please make brainliest to help me out!!
Thanks!!
