You are observing an organism under the microscope and you note that it has a cell wall, no chloroplasts, and a nucleus. Your prediction would be that this organism is a(n) ________.
A. bacterium
B. virus
C. alga
D. fungus
E. protozoan
Answer: D
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When we examine the fossil record, we find that older fossils are in strata below younger fossils.
a. true b. false
What is the difference between a stable isotope and a radioisotope?
a. A stable isotope emits light. b. A radioisotope emits radiation. c. A stable isotope emits radiation. d. A stable isotope absorbs radiation. e. A radioisotope has an unequal number of protons and electrons.
The ____ covers approximately 11% of Earth’s land and contains numerous lakes and ponds
a. boreal forest b. tropical rain forest c. temperate rain forest d. temperate deciduous forest e. tropical dry forest
Which cycle involves materials moving through a series of transfers from living to nonliving systems and then back again?
A) biogeochemical B) geological C) continental D) uranium-lead