How many species of mammals has been discovered till now?

A scientist wants to assign a newly discovered bacterial species to a kingdom: Eubacteria or Archaebacteria. Which of the following is the best question the scientist should ask? A- Is the species an autotroph or a heterotroph? B- Does the species have...

I cant understand what do they mean by this question. What rules? If we used the same arbitrary rules used to determine species of bacteria to determine species of mammals, how would humans be classified in relation to other primates

http://www.foxnews.com/scitech/2011/06/27/inflatable-shark-and-laughing-cicada-among-300-new-species-discovered-in/

It may seem weird but, from many experiences with ghosts, I have led to the conclusion that, ghosts may be another species we have not discovered, why Do I think this? Well first of all, how can ghosts function without a brain? It's really strange for...

like, of what a newly discovered species might have looked like, what features would you be confident in reproducing and what features would be speculation? Does our inability to know everything from the fossil record limit our ability to understand...

i heard there is a dinosaur species got discovered, and they used to be the biggest and strongest predator in the ocean, and they are lot more stronger than the T-Rex. but the T-Rex lived on lands and these new species dinosaur lived in the ocean, can...

i truly want to know when the squid and octopus were first discovered via time periods. but of course knowing the first species of both being discovered could easily lead to a time period. so please accurate answers for both would be very helpful for...