Only marsupials and placental mammals give brith to a live young, while monotremes lay eggs. Therefore, not all mammals are able to give birth to live a young.

B. giving birth to live young

Apes, lemurs, tarsiers, gibbons, macaques, and humans are members of the order Primates.

E. Primates

About 220 million years ago in the late Triassic Period, the first true mammals have emerged.

B. Triassic Period

Monotremes include duck-billed platypus and echidnas.

C. duckbill platypus

Primates have a large and well-developed brain. Because of this, they are able to perform different functions and display complex behaviors than other mammals.

E. a small brain in proportion to body size

The mammals are classified into groups in terms of the development of their offspring.

Placental Mammal:
The embryo develops inside the mother with the help of the placenta for nourishment. After birth, the mother cares for the young by nursing.

Marsupial:
Marsupials lack a placenta. Instead, they have marsupium to nourish their newborn young after birth. Marsupium is the protective pouch found in female marsupials in which their newborn marsupials are placed and carried in order to nourish and to continue its growth and development.

Monotremes:
Monotremes lay eggs. Once the eggs are hatched, the young ones lick the milk from the abdomen of their mothers.

A. method of development

A kangaroo is a marsupial. It lacks a placenta. Instead, it has a protective pouch where its offspring is carried.

C. kangaroo

According to the bar graph, the amount of carbon-14 that will remain at 11,540 years is 25 percent.

A. 25 percent

According to the results of the graph, if a fossil has 1/8 of the carbon-14, the estimated age of the fossil is 23,080 years old.

C. 23,080 years

Carbon-14 can only date fossils that are around 50,000 years old. Therefore, dating a fossil that is 75,000 years old is impossible using the radioactive isotope of carbon-14.

E. a 75,000-year-old fossil