Question
Asked Apr 7, 2019
3 views

5a. Define each of the 3 categories of mammals:

  • Eutherians
  • Marsupials
  • Monotremes:
check_circle

Expert Answer

Step 1

Mammals belong to the class Mammalia. They are the warm-blooded animals and rule the terrestrial ecosystem. They are the largest (like a whale) and the most intelligent animals (like humans) on the planet. They have some typical characteristics like the presence of backbone, four-chambered heart, hair, neocortex, and three middle ear bones. They also contain mammary glands to secrete milk and feed the young ones.

Step 2

Based on their mechanism of baby’s development, they are divided into three groups:

  1. Prototheria – They are also termed as monotremes. They are almost extinct now but are the only mammals that lay eggs. Only 5 species of them are alive now, which are, anteater, platypus, Tasmania, and New Guinea. They have a single hole, that is, through the same hole they lay eggs and pass out the waste products. They maintain their body temperature at 32°C.
  2. Marsupials – They are also termed as Metatheria. They are mostly found in Australia, with 200 species there alone. The examples of marsupials are kangaroos, opossums, and koalas. They contain pouc...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Biology

Taxonomy

Related Biology Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Mention the respiratory and urinary adjustments to acidosis and alkalosis.

A: Acidosis and alkalosis refer to the abnormal conditions resulting from an imbalance in the pH of the...

question_answer

Q: You have 100 pet llamas. Seventy-four of them have curly hair (42 homozygous dominant and 32 heteroz...

A: The Hardy-Weinberg law states that among generations, in the absence of any evolutionary force, the ...

question_answer

Q: 3a. Which phylum has the most ancient lineage?

A: Phylum is the second highest taxonomic after Kingdom. Large number of organisms sharing one or more ...

question_answer

Q: How can UV radiation, Gamma radiation, and Filtration of controlling microbial growth affect cells?

A: Several physical methods are used to control the growth of microorganisms. Radiation and filtration ...

question_answer

Q: 1. Is the potato a living organism? Is it a live? How do you know?

A: Biologists are continuously studying about the exact concept of life. Living things are too diverse,...

question_answer

Q: Why did we calculate, rather than measure, the diameter of the field of view on medium and high powe...

A: A microscope is an instrument used to visualize objects that are extremely small in size and cannot ...

question_answer

Q: Mismatches introduced during DNA replication are detected and repaired efficiently by the “Mut” syst...

A: (A) A repair mechanism of DNA (deoxyribonucleic acid) called as MMR (DNA mismatch repair) involves r...

question_answer

Q: What process can move a solute against its concentration gradient?

A: In biology, the collection of mechanisms which regulate the movement of solutes like ions and small ...

question_answer

Q: What is the treatment for pneumonia with immunocompromised

A: A person with an impaired immune system (immunocompromised) leads a very unhealthy life as he/she be...