Do all mammals have a placenta, Biology

Assignment Help:

Do all mammals have a placenta?

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

 


Related Discussions:- Do all mammals have a placenta

Natriuretic peptides, There are three natriuretic peptides-atrial (ANP) sto...

There are three natriuretic peptides-atrial (ANP) stored mainly in the atrium, brain (BNP) stored mainly in the ventricular myocardium and C-natriuretic peptide (CNP) located prima

Female reproductive system - vagina, V AGIN A - Median, elastic, musc...

V AGIN A - Median, elastic, muscular tube 7.5 cm long. Open into vestibule by vaginal orffice. The lining forms vaginal rugae. Space between vaginal wall & cervix is forn

What is nuclear pollution, What is nuclear pollution? Nuclear pollution...

What is nuclear pollution? Nuclear pollution having of radiations emitted from atomic nuclei, these radiations is highly injurious to living beings. They can be originated from

Sericulture, i want to know about sericulture for assignment degree level

i want to know about sericulture for assignment degree level

Intracellular sodium concentration of the motor neuron, Intracellular sodiu...

Intracellular sodium concentration of the motor neuron A complete motor neuron is removed from a frog and placed in normal physiological saline at 1 AM.  The neuron is healthy.

Define poverty and ignorance - cause of anaemia is dietary, Define Poverty ...

Define Poverty and ignorance - cause of anaemia is dietary? Low purchasing power of the communities and their consequent inability to meet the nutrient requirements, even after

What is aneuploidy, What is aneuploidy? What are the conditions caused by t...

What is aneuploidy? What are the conditions caused by the aneuploidies? The Aneuploidy is an abnormal number of chromosomes in the cells of an individual. The major aneuploi

What is mechanical digestion, What is mechanical digestion? In molluscs, ar...

What is mechanical digestion? In molluscs, arthropods, earthworms, birds and vertebrates, in general, which organs respectively participate in this type of digestion? Mechanica

Determine about the degenerative diseases, Determine about the degenerative...

Determine about the degenerative diseases Immune responses in brain can quickly spiral out of control and cause further harm. In degenerative diseases such as Parkinson's, Alz

What is an antigen, Q. What is an antigen? Antigen is any substance, in...

Q. What is an antigen? Antigen is any substance, infectious or particle agent recognized as foreign to the body. The contact of the antigen with the body promotes a defense rea

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