What respiratory adaptation was important for the invasion of land by arthropods?
A. positive pressure breathing to increase gas exchange
B. cutaneous respiration in moist habitats
C. gas- and water-permeable exoskeletons
D. the ability to close spiracles to prevent water loss
E. countercurrent exchange surrounding the trachea
D. the ability to close spiracles to prevent water loss
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Which of the following adversely affects the ozone layer?
A. chlorofluorocarbons B. greenhouse gases C. oil D. coal and natural gas E. plastics
In ________ several ribosomes can simultaneously translate a single mRNA molecule in a complex called a(n) ________
A) prokaryotes / polysome B) eukaryotes / polysome C) prokaryotes / initiation complex D) eukaryotes / splicing complex
The organism shown here represents the
__________ stage in the life cycle. a. sporophyte b. gametophyte c. haploid d. motile e. feeding
Unlike terrestrial plants, submerged aquatic plants lack
A) leaves. B) chlorophyll. C) stomata. D) stems.