Epidermal placodes are:
A. epidermal thickenings that give rise to integumental coverings such as feathers and hair
B. epidermal thickenings that give rise to the lateral line system
C. epidermal thickenings that lead to the formation of mesoderm
D. epidermal thickenings that give rise to skin glands
E. none of the choices provided
A. epidermal thickenings that give rise to integumental coverings such as feathers and hair
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The taxon that is composed of similar species that have several important features in common but differ sufficiently to still maintain their status as individual species is which one of the fol-lowing?
a. Class b. Order c. Family d. Genus
Recent discoveries of microscopic fossils have extended the known history of life to about:
A. 1 billion years ago. B. 2 billion years ago. C. 3.5 billion years ago. D. 4.5 billion years ago.
One technique for chromosome analysis is called ____________________, which uses chromosome-specific DNA
sequences attached to fluorescent dyes to target specific chromosomal regionsFill in the blank(s) with the appropriate word(s).
Which of the following immune system components has been identified in almost all multicellular
organisms? a. bone marrow b. phagocytes c. antimicrobial peptides d. T-cells e. memory cells