Joseph is an adolescent boy. his mother is worried, as he still does not have any facial hair. his voice has not turned hoarse. he has slight enlarged breast. what could be the probable cause of his disorder?
a.) extra genetic material at 21st chromosome
b.) extra x chromosome
c.) extra y chromosome
d.) sickle shaped blood cells
e.) toxic levels of fat accumulating in the brain

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.