Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.
It could be said that today's Australian marsupials and today's placental mammals have
A. undergone convergent evolution.
B. undergone divergent evolution.
C. undergone selective advantage.
D. developed homologous structures.
E. undergone heterozygote advantage.
Answer: A
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Because embryonic stem cells can form any tissue in the human body, they are termed ____________________; adult stem cells, on the other hand, are ____________________, since they can only form a limited number of cells types
Fill in the blank(s) with correct word
All evolutionarily meaningful characters evolve at the same rate
Indicate whether the statement is true or false.
Why is the velocity of blood flow lowest in capillaries?
a. Capillaries are far from the heart, and blood flow starts to slow as it moves away from the heart. b. The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle. c. The total surface area of capillaries is larger than the total surface area of the arterioles. d. The capillary walls are not thin enough to allow oxygen to exchange with the cells. e. The diastolic blood pressure is too low to deliver blood to capillaries at a high flow rate.
What do scientists use to apply cladistics?
a. homologous traits b. homoplasies c. analogous traits d. monophyletic groups