Crocodiles are living representatives of which lineage?
a. archosaurs
b. lepidosaurs
c. synapsids
d. anapsids
Ans: a. archosaurs
You might also like to view...
Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
When did the first plants evolved from algae?
A. 4.7 billion years ago B. 470 million years ago C. 470 thousand years ago D. We do not know exactly when the first plants evolved from algae.
Which term best explains why collagen fibers are abundant in tendons?
a. abrasion b. contractility c. protection d. strength e. secretion
Despite causing a life-threatening disease, the sickle-cell allele in some areas of Africa has remained in high frequency in those populations because it protects against malaria
In the United States, malaria was eradicated shortly before World War II by eliminating the mosquito that spreads the disease. What is likely to happen to the frequency of the sickle-cell allele in African Americans living in the United States? A) The frequency of the sickle-cell allele will decrease. B) The frequency of the sickle-cell allele will not change. C) The sickle-cell allele will disappear from the African American population. D) The normal allele will disappear from the African American population. E) The frequency of the sickle-cell allele will increase.