Do all mammals have a placenta, Biology

Assignment Help:

Q. Do all mammals have a placenta?

Mammals of the monotreme group (platypus, echidnas) are oviparous egg- laying and they don't have a placenta. Mammals of the marsupial group (koalas, kangaroos, opossums) do not have a placenta either females of this group give birth to embryonic young that then continue development within the mother's pouch, placenta only forms in female placental mammals.


Related Discussions:- Do all mammals have a placenta

Genetic, what are the limitation of mendelian experiment

what are the limitation of mendelian experiment

Do algae reproduce sexually or asexually, Do algae reproduce sexually or as...

Do algae reproduce sexually or asexually? There are algae that replicate sexually and there are algae that replicate asexually. In unicellular algae reproduction is usually

Emboly - mechanism of gastrulation, EMBO L Y - The embolic morphogene...

EMBO L Y - The embolic morphogenetic movements are concerned with the inward migration of prospective endodermal and mesodermal blastomeres from the external surface of blast

Difference between the reptile heart and the amphibian heart, Q. What is th...

Q. What is the difference between the reptile heart and the amphibian heart? The reptiles have incomplete and double circulation three heart chambers two atria and one ventricl

How many cellular nuclei does the pollen tube have, How many cellular nucle...

How many cellular nuclei does the pollen tube of angiosperms have? What is the ploidy of each of these nuclei? The pollen tube that is the mature male gametophyte of angiosperm

Cancer, What is Cancer? Besides AIDS, Cancer is another deadly human di...

What is Cancer? Besides AIDS, Cancer is another deadly human disease of our times about which people are panicky all over the world. It is estimated that one in every three per

The movements of the foetus in which month of pregnancy, The first movement...

The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy? 1. Fourth month 2. Fifth month 3. Sixth month

What is ammensalim, What is ammensalim? Ammensalism is the ecological i...

What is ammensalim? Ammensalism is the ecological interaction in which an individual harms another without obtaining advanatage. Ammensalism is an inharmonious (negative) ecolo

Classification of plant on the basis of their resemblances, Q. Classificati...

Q. Classification of plant on the basis of their resemblances? Pliny seemed to have little interest in the classification of plant on the basis of their resemblances. He classi

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd