Select 3 that apply.
Mammals are grouped into:
monotremes
larval
marsupials
placentals
cartilaginous
monotremes, marsupials, placentals
What is the definition of a mammary gland?
A)a mammal which gives birth to a fetus that moves into a pouch for protection and nourishment
B)having a placenta, the organ that nourishes young until birth
C)the gland of a mammal that produces milk for the young
D)a mammal that has just one passage for elimination and egg laying
E)a tube that connects an unborn baby to its mother for nourishment
C) the gland of a mammal that produces milk for the young.
To select the three options that apply to the grouping of mammals, you can first understand the characteristics of each option:
1. Monotremes: These are mammals that lay eggs. Examples include platypus and echidna.
2. Marsupials: These mammals give birth to relatively undeveloped young that further develop in a pouch. Examples include kangaroos, koalas, and opossums.
3. Placentals: These are mammals that give birth to live young, which develop inside the mother's womb with the help of a placenta. Examples include humans, dogs, cats, and whales.
4. Larval: This term refers to the immature stage of an organism's life cycle, typically seen in insects, amphibians, and certain marine animals. It is not applicable to mammals.
5. Cartilaginous: This refers to animals with a skeleton made of cartilage, such as sharks and rays. While they are a type of animal, they are not classified as mammals.
Based on this information, the three options that apply to the grouping of mammals are monotremes, marsupials, and placentals.