Geologists refer to remnants of ancient organisms that have changed rapidly in a well defined way to adapt to changing environmental conditions as
a) grading samples.
b) correlation tools.
c) human time scale pointers.
d) index fossils.
d
You might also like to view...
An object starts from rest with an acceleration of 2.0 
for 3.0 seconds. It then reduces its acceleration to 1.0 
for 5.0 additional seconds. The total distance covered is
A. 52 m. B. 38 m. C. 11 m. D. 9.0 m. E. 7.6 m.
What happened to the quarks that existed freely during the particle era?
A) They combined to make protons, neutrons, and their antiparticles. B) They froze out of the soup of particles at the end of the era. C) They evaporated. D) They combined to make electrons and neutrinos. E) They combined to make W and Z bosons.
The type of radiation affected by greenhouse gasses is
a. UV radiation. b. IR radiation. c. visible radiation. d. gamma radiation.
If the speed of light in a sphere is 2 x 10^8 m/s, its index of refraction is
a. 1.0 b. .67 c. 2.0 d. .50 e. 1.5