Which of these describes variation within a species or population? A population is defined as members of the same species living together in the same area and who are likely to breed with each other.

Evergreen trees have needle-like leaves

Rex rabbits can have one of 16 different colors of fur

Fish use gills to obtain oxygen from water

Which of the following observations 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 can be found on islands located farther from the mainland than the birdsê¹ maximum nonstop flightdistance.d) south american temperate plants are more similar to the tropical plants of south america than to thetemperate plants of europe.e) earthquakes reshape life by causing mass extinctions.