Final answer:
Placental mammals produce a small number of large offspring, which increases their chances of survival.
Step-by-step explanation:
Placental mammals give birth to a relatively large and mature fetus. This is possible because they have a placenta to nourish the fetus and protect it from the mother's immune system. This allows for a long period of growth and development before birth. The fact that placental mammals produce a small number of large offspring is true. The large size and maturity of the offspring increases their chances of survival.