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

Respiration in cockroach, what is the chemical reaction of respiration in c...

what is the chemical reaction of respiration in cockroach?

Munch pressure flow model, Munch Pressure Flow Model Munch, a German p...

Munch Pressure Flow Model Munch, a German plant physiologist, proposed in 1930, a simple physical model which can be tested in the laboratory for the mechanism of phloem trans

Microbiology quiz question, Each of the following are true of antimicrobial...

Each of the following are true of antimicrobial therapeutic drugs except A. Non-toxic to host B. Easily broken down by host C. Easily administered D. Limited capacity to elicit

Obelia, what are the economic importance of obelia?

what are the economic importance of obelia?

What are the two main types of endocytosis, What are the two main types of ...

What are the two main types of endocytosis? Endocytosis can be divided as pinocytosis or phagocytosis. In pinocytosis small particles on the external surface of the membrane ex

What is low gradient aortic stenosis, Q. What is Low Gradient Aortic Stenos...

Q. What is Low Gradient Aortic Stenosis? One may come across patients who have severe left ventricular dysfunction and modest gradients across aortic valve. This situation may

What is implant prior to stage 2 surgery, Enumerate the different means of ...

Enumerate the different means of evaluating the implant prior to stage 2 surgery. The Different means for evaluating the implant prior to stage 2; i) Radiographic evaluation

Define precaution-estimation of nitrogen and protein content, Define Precau...

Define Precautions - Estimation of Nitrogen and Protein Content? 1. The apparatus should be airtight to prevent leakage of NH 3 . 2. The tip of the delivery tube should be i

Purpose of supervision - management principles, Purpose of Supervision: ...

Purpose of Supervision: Purpose: To help the personnel to grow, to know themselves and what they need in order to render the most efficient service and to give them assistance

What gases was the earth''s primitive atmosphere constituted, Before the em...

Before the emergence of life of what gases was the earth's primitive atmosphere constituted? The earth's primitive atmosphere was fundamentally formed of methane, hydrogen, amm

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