Which trait does the fossil in the accompanying figure share with modern birds?
a. long, clawed fingers on each forelimb
b. teeth
c. Feathers
d. long bony tail
e. heavy jaw
ANSWER: c
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Several biology students have just returned from a field trip in which they were asked to collect prokaryotes and eukaryotes
The eukaryotic organisms were to be divided into plant cells, animal cells, or "other." The students have access to a light and electron microscope. Can you suggest how they could determine whether these cells are prokaryotic or eukaryotic? How could they distinguish plant from animal cells? What will be an ideal response?
Molecules whose concentration and position in an embryo determine some aspect of development are called ________
Fill in the blank(s) with correct word
This kind of mutation causes a ribosome to stop protein syntheses by introducing a stop codon too early.
A. missence B. nonsense C. point D. All of these answers are true.
Environmental pressures on a population, such as temperature and pH, are density ________ factors
Fill in the blank(s) with correct word