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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

The organism shown here represents the

__________ stage in the life cycle. a. sporophyte b. gametophyte c. haploid d. motile e. feeding

Biology & Microbiology

Unlike terrestrial plants, submerged aquatic plants lack

A) leaves. B) chlorophyll. C) stomata. D) stems.

Biology & Microbiology