A Survey Is Not Valid If It

question 100

Multiple Choice

A survey is not valid if it

• A)does not include at least 50 responses.
• B)is more than one year old.
• C)fails to measure what it is intended to measure.
• D)lacks secondary evidence to supplement it.

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Definitions:

Oxygen

A chemical element (O) essential for cellular respiration in living organisms and a component of the earth's atmosphere.

Maternal Blood

Blood circulating in a pregnant woman that provides nutrients and oxygen to both the mother and the fetus.

Embryonic Blood

Blood cells that are present in an embryo, fundamental in the development of the circulatory system.

Fetal Blood

Blood that circulates through a fetus, which has unique properties, such as a higher concentration of hemoglobin, to efficiently carry oxygen from the placenta.