Multiple ChoiceIn the life cycle of a fern, the multicellular male gametangium (the sex organ that produces sperm cells) is called a(n) __________. 459views
Multiple ChoiceIn the life cycle of ferns, the multicellular female gametangium (the sex organ that contains an egg) is a(n) __________. 434views
Multiple ChoiceThe "dots" on the underside of a fern frond are spore cases; therefore, what is true of the plant to which the frond belongs? 914views
Multiple ChoiceThe first large forests formed in the Carboniferous period. The decrease in CO2 levels by all of these plants caused __________. 519views
Textbook QuestionMicrophylls are found in which plant group? a. lycophytes b. liverworts c. ferns d. hornworts694views
Textbook QuestionSoils, water, and the atmosphere are major components of the abiotic (nonliving) environment. Describe how green plants affect the abiotic environment in ways that are advantageous to humans.249views
Textbook QuestionCompare and contrast the effects of removing growth factors from asynchronous cultures of human cells that are normal and those that are cancerous.636views
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