plsss do this question fasttttt answer all the three question
Answers
placenta is a disc like tissue embedded in d uterus of mother...
placenta helps d baby to be more safer nd it is required for providing nourishment nd maintainance of d foetus...
it supplies food nd water from d mother's blood to d foetus...
waste substances produced by embryo r removed by placenta...
it possesses villi that increases d surface area for fixation nd absorption...
and second one..!
evolution is d gradual change in a species genetic makeup that allows to adapt to its surroundings better than the other... individuals with this beneficial mutation will have better chance of surviving to pass on their genes...this is called as SURVIVAL OF THE FITTEST...
FOSSILS are preserved structures of dead organisms that existed in d past ....the dead organisms structure couldn't delayed by microorganisms nd they got hardened... FOSSILS provide a record of how plants nd animals have developed from simple organisms to complex form and provides proof of existence of life on earth billions of years ago..
hope this helps u! pls mark me as d brainliest!!!