The Maximum Likelihood Tree Constructed for the Mammals in the Figures

question 23

Multiple Choice

The maximum likelihood tree constructed for the mammals in the figures above supports which of the competing hypotheses for the evolutionary relationships among mammalian groups?

• A)The Marsupionta hypothesis
• B)The Theria hypothesis
• C)Neither theory
• D)Both theories

---

Definitions:

Market

Any place where buyers and sellers exchange goods and services.

Barriers Blocking Entry

Impediments and restrictions that make it difficult for new firms to enter a market, often ensuring existing companies retain their market share.

Perfect Competitor

A theoretical market situation where numerous small firms compete against each other with no single company controlling the market price.

Economic Profits

Profits calculated by subtracting both explicit and implicit costs from total revenues, indicating the total financial gain.