In angiosperms, pollen grains are (1 point)

a. diploid, and are made when haploid gametes join in fertilization.
b. diploid, and are made when haploid gametophytes join in pollination.
c. haploid, and are made when haploid spores undergo mitosis.
d. haploid, and are made when haploid ovules undergo meiosis.

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.