What human organ is formed from two genetically-different tissues?
A. neural crest
B. neural tube
C. placenta
D. uterus
C. placenta
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The continued high frequency of the sickle allele (S) of hemoglobin in Africans, in some Mediterranean populations, and in populations descended recently from Africans is a reflection of the response of ____ to a regional disease
Fill in the blank with the appropriate word.
The immune system consists of ____
a. physical barriers only b. innate immunity only c. adaptive immunity only d. innate and adaptive immunity only e. physical barriers, innate immunity, and adaptive immunity
In biology, fitness is defined as _____.
A. the ability of an individual to detect life-threatening situations B. the ability of an individual to successfully capture prey C. the ability of an individual to produce surviving offspring D. the ability of an individual to perform physical feats of strength
Protozoa are susceptible to viral attack.
Answer the following statement true (T) or false (F)