The large, fluid-filled spaces within the brain are called the:
a. choroid plexus.
b. ventricles.
c. meninges.
d. pia mater.
B
The four large, fluid-filled spaces in the brain are the ventricles. Specialized secretory cells called the choroid plexus produce CSF. The choroid plexus is located centrally within the brain in the third and fourth ventricles.
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Scientific inquiry in biology is linked in a concept map with two sets of understanding researchers might pursue in experiments. Which of these is a good example of why concepts are linked between what is studied and how it might be studied?
A. Environmental changes over recent decades have led to studies of whether specific plants and animals can adapt to the changes. B. A research physician hypothesizes that a new skin therapy will result in healthier skin tissues for healing. C. The influenza virus is spreading rapidly throughout the population and is not being controlled by the current flu medication. D. All of the answer choices are correct. E. A newly identified bacterium in African soils is found to promote plant growth that a researcher will study in crop production.
If a pure-breeding wired-hair terrier (WW) is crossed with a pure-breeding smooth-hair terrier (ww), and a puppy with
a wavy hair is produced, the simplest explanation is ____.
a. a mutation has occurred b. hair texture is an X-linked trait c. incomplete dominance d. hair texture is a lethal trait e. codominance
In most food webs, chain lengths are
A. complex. B. long. C. short. D. sixteen. E. two.
What discoveries in the fossil record led to
questioning the concept that species didn’t change?
a. the oldest layers contain fossils of simpler organisms b. more recent layers contain fossils more similar to existing species c. many fossils were found of extinct animals d. more recent layers contain fossils that are more complex than earlier ones e. all of these are discoveries in the fossil record that led to questioning the concept that species didn’t change