Ancestors of the koala lived on the ground, but modern koalas live in trees and eat eucalyptus leaves, which are poisonous to most other animals. The difference between the ancestor and modern koalas was caused by
A. the presence of homologous structures
B. the presence of vestigal organs
C. selective breeding
D. natural selection
Answer: D. natural selection
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A. Cyclins B. Histone proteins C. Condensins D. FtsZ
What is an organism's advantage to having a single reproductive event in a lifetime rather than being able to reproduce repeatedly? a. Reach a higher level of reproductive maturity
b. Having to raise only one group of offspring. c. Being able to invest all its energy into the production of offspring. d. Being able to divide energy among growth, reproduction and maintenance.
Which of the following are the largest projections of
the mucosal wall? a. microvilli b. cilia c. villi d. submucosal foldings e. serosal foldings
The first line of defense against foreign invaders is ____
a. adaptive immunity b. the immune system c. B and T cell activity d. physical and chemical barriers e. antibody production