Joseph Connell discovered that Balanus barnacles were excluded from the upper intertidal zone by , while Chthalamus barnacles were excluded from the middle intertidal zone by .

Agene in a type of bacteria when the ses bacteria reproduce asexually this mutation can only be inherited by

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.

All other things being equal the size of a population will decrease if