Flashcards in B2 Biology - Speciation Deck (9)
what three ways are fossils formed?
gradual replacement from minerals
casts and impressions
preservations in places no decay happens
what are casts and impressions?
organism buried in soft mineral like clay, clay hardens and organism decays leaving a cast of itself
where can preservation of fossils happen?
what are some reasons why species become extinct? ( 6 reasons)
cant compete for food
new species develops
what is speciation?
development of new species
when does speciation occur?
when populations of the same species become so different that they no longer breed together to produce fertile offspring
what is isolation?
where populations of species are separated
when does isolation occur?
physical barrier eg. floods, earthquakes
different characteristcs or change in environment