Each branch of an evolutionary tree represents _____.
a. a mutation
b. a speciation event
c. multiple speciation events
d. a single individual
e. an environmental pressure
Ans: b. a speciation event
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Which portion of the brain has shown the most dramatic changes in size in the evolution of birds and mammals?
A. hindbrain B. midbrain C. forebrain D. cerebellum E. medulla oblongata
In chemistry, what is a base?
a. A base is any substance that increases the hydrogen ion (H+) concentration in a solution. b. A base provides either hydrogen ions (H+) or positively charged ions that combine with hydroxide ions (OH-). c. A base provides either hydroxide ions (OH-) or negatively charged ions that combine with hydrogen ions (H+). d. A base is any substance that increases the hydroxide ion (OH-) concentration in a solute.
An ecosystem is made up of ____
a. only plants, animals and fungi b. organisms and nonliving things c. only rocks and minerals d. only plants, protozoa, and fungi e. the biosphere of the region
The root of a carrot serves as
A. Only a translocation sink B. Only a translocation source C. Both a translocation source and sink D. Only a transpiration source