Ask a New Question
Menu

PLEASE HELP!!!!

1. How many millions of years ago did sharks first appear? (Make sure you are looking for animals that only have cartilage skeletons).
2. How many millions of years ago did bony fish (like the perch) first appear?
3. How many millions of years ago did amphibians first appear?
4. How many millions of years ago did reptiles first appear?
5. How many millions of years ago did modern birds (aves) appear?
6. How many millions of years ago did mammals first appear?
7. How many millions of years ago did humans first appear? (This date will vary depending on the source you pull from but you will at least be in the general proximity).

1 answer

http://en.wikipedia.org/wiki/Timeline_of_evolutionary_history_of_life

http://www.usefulcharts.com/science/human-evolution-timeline.html
Similar Questions
    1. answers icon 1 answer
  2. 2 - What happened to sharks as their environment changed in Passage 1?* 10 points A) Sharks slowly dwindled in population. B)
    1. answers icon 11 answers
  3. 1Many people fear sharks because of their big, sharp teeth. However, their teeth make them one of the coolest animals on the
    1. answers icon 1 answer
  4. When were fossil fuels formed(1 point)Responses less than 100 years ago less than 100 years ago hundreds of years ago hundreds
    1. answers icon 1 answer
more similar questions