Food chains in the ocean depths tend to be long
because these habitats have
a. an abundance of producers.
b. stable environmental conditions.
c. a variety of energy sources.
d. an abundance of decomposers.
e. small numbers of predators.
Answer: b
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Plate tectonics causes oceanic ridges to form where ____
a. continental plates collide b. shallow seas dry up c. magma rises through fissures in the sea floor d. old oceanic crust sinks below continental crust e. subduction uplifts continental crust
The phase of mitosis in which the chromosomes are aligned along the equator of the cell is
A. A, which is prometaphase. B. C, which is metaphase. C. D, which is anaphase. D. A, which is prophase. E. E, which is telophase.
Which statement is NOT true about the RNA-first hypothesis?
A. It says that first RNA, then DNA, and then proteins would have been necessary to interact in the chemical evolution that would have led to the development of the first cells. B. It is supported by the discovery that RNA can act as an enzyme. C. It is supported by the fact that some viruses have RNA as their genetic material. D. It suggests that there was an "RNA world" about 4 billion years ago.
Under which conditions would your run a t-test?
A. When the independent variable is continuous and the dependent variable is discrete B. On variables that are only discrete C. On variables that are only continuous D. When the independent variable is discrete and the dependent is continuous