IIT JAM
Gurmeet singh Asked a Question
August 21, 2020 5:01 pmpts 30 pts
  • IIT JAM
  • Geology (GG)

Sir please elaborate 1st three lines only. especially these 2 words - rift valley and selection pressure.

Vegetation was still dominated by conifers, cycads and ferns for much of the Cretaceous but as the environments of the world changed, new species were getting a chance. The rift valleys that were forming at the splits between continents provided new environments that increased selection pressures
  • 1 Answer(s)
Answer Now
  • like-1
  • 1 Likes
  • 1 Comments
  • Shares
  • Sajan sarthak Best Answer
    Here it is describing that the plants like conifers and cycads survived untill the climate and environment change . The new species are getting evolved as the environment was cha...
    Show more
    Likes(1) Reply(2)
    Gurmeet singh
    sir one more word - the foliage of dicroidium was very fern like. wht is foliage means.