the answer is D. Access to prevention and treatment became more available.
Answer:This threat to internal validity is called TESTING.
Explanation:
Testing refers a instant when a test is repeated with measures remaining constant as they were in the first test.
If participants are given the same test multiple times it is very likely that they may perform better only because they have mastered the test procedure and can now know how to respond better.
This will affect internal validity of the test because the result are no longer the real presentation of the outcome of the test.
Internal validity refers to how trustworthy an outcome is when looking at the cause and effect.
Native Americans are believed to have descended from the Northeast Asia arriving over a land bridge between Siberia and Alaska about 15,000 years ago and then migrated across North America
I believe the answer is: <span>Label the object with a sign or fingerspelling.
Pronominal classifiers refers to the pronoun that is used to represent a particular group of nouns.
Since the group of nouns has a distinguish characteristic that must be differentiated with another group, labelling the object would be necessary.</span><span />