The oldest fossils of eukaryotic cells are about ________ years old.
A. 1.8 billion
B. 3.5 billion
C. 500 million
D. 100 million
A. 1.8 billion
You might also like to view...
Oak trees and many other plant species have years in which they have synchronous production of many progeny by all individuals in a population. This is known as
A. sympatry. B. crypsis. C. armorment. D. masting. E. None of the choices are correct.
A molecule of water in the middle of a chunk of ice will usually have ____ hydrogen bonds with other water
molecules.
a. 2 b. 3 c. 3.4 d. 4 e. 6
The maximum volume of air that can be expired following a resting expiration is called
A) tidal volume. B) vital capacity. C) expiratory reserve volume. D) inspiratory reserve volume. E) inspiratory capacity.
The causative agents of bubonic plague, which killed 100 million people during the 14th century, were
A) viruses. B) fish. C) fleas. D) rats. E) bacteria.