What is the name of the part of the human skeleton which protects our brain?

You can tell from this karyotype that the individual is female because the karyotype has two chromosomes labeled

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.

Plz ! what does it mean for an allele to be dominant?