Why do some biologists use the name Craniata instead of the name Vertebrata?
A. Hagfish have a bony cranium but no
vertebrae.
B. Hagfish are too different from
Cephalochordates to be included in that
group.
C. Hagfish are not represented by very many
species, so cannot be given their own
taxonomic grouping.
D. Hagfish are understudied, so can only be
grouped with other taxa based on their lack of
characters.
A
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. Stratification refers to the extended exposure to ________________ that is required for some seeds to germinate.
A. long wavelengths of light B. low temperatures C. high relative humidity D. short daylengths E. clay soil particles
The movement of molecules from an area of high concentration to an area of lower concentration is called ________.
A. osmosis B. active transport C. diffusion D. facilitated diffusion E. endocytosis
Which of the following is human's closest living relative?
A) Gibbons B) Gorillas C) Chimpanzees D) Baboons
Mesophyll cells are primarily responsible for:
A) photosynthesis. B) regulating passage of carbon dioxide into the leaf. C) protection of a leaf. D) transport of water.