A feature unique to mammals includes ________
A) the presence of hair
B) extended parental care of the young
C) being endotherms
D) having no egg-laying members
A
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A hectare of wheat fixes 32,000 kg of carbon per year through photosynthesis and uses 7,000 kg of carbon per year for cellular respiration. The net primary productivity of the wheat field is therefore _____ kg of carbon/hectare/year.
Fill in the blank(s) with the appropriate word(s).
Animals with a crown of cilia that look like a spinning wheel are the:A
bryozoans. B. phoronids. C. ctenophores. D. rotifers. E. platyhelminthes.
What kind of molecule forms a bilayer that is the basis for all cellular membranes?
A) carbohydrate B) cholesterol C) phospholipid D) protein
A group is considered monophyletic if
A. it is the most parsimonious grouping. B. the group does not contain the most recent common ancestor. C. not all descendants of the common ancestor are included. D. all members of the group share a common ancestor that is included in the group. E. all members share homoplastic traits.